Added the CSV_MIME constant to test_report.py to simplify the ReportTestCase test case.

src/accounting/account/views.py

@@ -53,7 +53,7 @@ def list_accounts() -> str:
                            list=pagination.list, pagination=pagination)
 
 
-@bp.get("/create", endpoint="create")
+@bp.get("create", endpoint="create")
 @has_permission(can_edit)
 def show_add_account_form() -> str:
     """Shows the form to add an account.
@@ -70,7 +70,7 @@ def show_add_account_form() -> str:
                            form=form)
 
 
-@bp.post("/store", endpoint="store")
+@bp.post("store", endpoint="store")
 @has_permission(can_edit)
 def add_account() -> redirect:
     """Adds an account.
@@ -91,7 +91,7 @@ def add_account() -> redirect:
     return redirect(inherit_next(__get_detail_uri(account)))
 
 
-@bp.get("/<account:account>", endpoint="detail")
+@bp.get("<account:account>", endpoint="detail")
 @has_permission(can_view)
 def show_account_detail(account: Account) -> str:
     """Shows the account detail.
@@ -102,7 +102,7 @@ def show_account_detail(account: Account) -> str:
     return render_template("accounting/account/detail.html", obj=account)
 
 
-@bp.get("/<account:account>/edit", endpoint="edit")
+@bp.get("<account:account>/edit", endpoint="edit")
 @has_permission(can_edit)
 def show_account_edit_form(account: Account) -> str:
     """Shows the form to edit an account.
@@ -121,7 +121,7 @@ def show_account_edit_form(account: Account) -> str:
                            account=account, form=form)
 
 
-@bp.post("/<account:account>/update", endpoint="update")
+@bp.post("<account:account>/update", endpoint="update")
 @has_permission(can_edit)
 def update_account(account: Account) -> redirect:
     """Updates an account.
@@ -148,7 +148,7 @@ def update_account(account: Account) -> redirect:
     return redirect(inherit_next(__get_detail_uri(account)))
 
 
-@bp.post("/<account:account>/delete", endpoint="delete")
+@bp.post("<account:account>/delete", endpoint="delete")
 @has_permission(can_edit)
 def delete_account(account: Account) -> redirect:
     """Deletes an account.
@@ -167,7 +167,7 @@ def delete_account(account: Account) -> redirect:
     return redirect(or_next(__get_list_uri()))
 
 
-@bp.get("/bases/<baseAccount:base>", endpoint="order")
+@bp.get("bases/<baseAccount:base>", endpoint="order")
 @has_permission(can_view)
 def show_account_order(base: BaseAccount) -> str:
     """Shows the order of the accounts under a same base account.
@@ -178,7 +178,7 @@ def show_account_order(base: BaseAccount) -> str:
     return render_template("accounting/account/order.html", base=base)
 
 
-@bp.post("/bases/<baseAccount:base>", endpoint="sort")
+@bp.post("bases/<baseAccount:base>", endpoint="sort")
 @has_permission(can_edit)
 def sort_accounts(base: BaseAccount) -> redirect:
     """Reorders the accounts under a base account.

src/accounting/base_account/views.py

@@ -41,7 +41,7 @@ def list_accounts() -> str:
                            list=pagination.list, pagination=pagination)
 
 
-@bp.get("/<baseAccount:account>", endpoint="detail")
+@bp.get("<baseAccount:account>", endpoint="detail")
 @has_permission(can_view)
 def show_account_detail(account: BaseAccount) -> str:
     """Shows the account detail.

src/accounting/currency/views.py

@@ -55,7 +55,7 @@ def list_currencies() -> str:
                            list=pagination.list, pagination=pagination)
 
 
-@bp.get("/create", endpoint="create")
+@bp.get("create", endpoint="create")
 @has_permission(can_edit)
 def show_add_currency_form() -> str:
     """Shows the form to add a currency.
@@ -72,7 +72,7 @@ def show_add_currency_form() -> str:
                            form=form)
 
 
-@bp.post("/store", endpoint="store")
+@bp.post("store", endpoint="store")
 @has_permission(can_edit)
 def add_currency() -> redirect:
     """Adds a currency.
@@ -93,7 +93,7 @@ def add_currency() -> redirect:
     return redirect(inherit_next(__get_detail_uri(currency)))
 
 
-@bp.get("/<currency:currency>", endpoint="detail")
+@bp.get("<currency:currency>", endpoint="detail")
 @has_permission(can_view)
 def show_currency_detail(currency: Currency) -> str:
     """Shows the currency detail.
@@ -104,7 +104,7 @@ def show_currency_detail(currency: Currency) -> str:
     return render_template("accounting/currency/detail.html", obj=currency)
 
 
-@bp.get("/<currency:currency>/edit", endpoint="edit")
+@bp.get("<currency:currency>/edit", endpoint="edit")
 @has_permission(can_edit)
 def show_currency_edit_form(currency: Currency) -> str:
     """Shows the form to edit a currency.
@@ -123,7 +123,7 @@ def show_currency_edit_form(currency: Currency) -> str:
                            currency=currency, form=form)
 
 
-@bp.post("/<currency:currency>/update", endpoint="update")
+@bp.post("<currency:currency>/update", endpoint="update")
 @has_permission(can_edit)
 def update_currency(currency: Currency) -> redirect:
     """Updates a currency.
@@ -151,7 +151,7 @@ def update_currency(currency: Currency) -> redirect:
     return redirect(inherit_next(__get_detail_uri(currency)))
 
 
-@bp.post("/<currency:currency>/delete", endpoint="delete")
+@bp.post("<currency:currency>/delete", endpoint="delete")
 @has_permission(can_edit)
 def delete_currency(currency: Currency) -> redirect:
     """Deletes a currency.
@@ -169,7 +169,7 @@ def delete_currency(currency: Currency) -> redirect:
     return redirect(or_next(url_for("accounting.currency.list")))
 
 
-@api_bp.get("/exists-code", endpoint="exists")
+@api_bp.get("exists-code", endpoint="exists")
 @has_permission(can_edit)
 def exists_code() -> dict[str, bool]:
     """Validates whether a currency code exists.

src/accounting/journal_entry/views.py

@@ -49,7 +49,7 @@ bp.add_app_template_filter(format_amount_input,
 bp.add_app_template_filter(text2html, "accounting_journal_entry_text2html")
 
 
-@bp.get("/create/<journalEntryType:journal_entry_type>", endpoint="create")
+@bp.get("create/<journalEntryType:journal_entry_type>", endpoint="create")
 @has_permission(can_edit)
 def show_add_journal_entry_form(journal_entry_type: JournalEntryType) -> str:
     """Shows the form to add a journal entry.
@@ -71,7 +71,7 @@ def show_add_journal_entry_form(journal_entry_type: JournalEntryType) -> str:
     return journal_entry_op.render_create_template(form)
 
 
-@bp.post("/store/<journalEntryType:journal_entry_type>", endpoint="store")
+@bp.post("store/<journalEntryType:journal_entry_type>", endpoint="store")
 @has_permission(can_edit)
 def add_journal_entry(journal_entry_type: JournalEntryType) -> redirect:
     """Adds a journal entry.
@@ -98,7 +98,7 @@ def add_journal_entry(journal_entry_type: JournalEntryType) -> redirect:
     return redirect(inherit_next(__get_detail_uri(journal_entry)))
 
 
-@bp.get("/<journalEntry:journal_entry>", endpoint="detail")
+@bp.get("<journalEntry:journal_entry>", endpoint="detail")
 @has_permission(can_view)
 def show_journal_entry_detail(journal_entry: JournalEntry) -> str:
     """Shows the journal entry detail.
@@ -111,7 +111,7 @@ def show_journal_entry_detail(journal_entry: JournalEntry) -> str:
     return journal_entry_op.render_detail_template(journal_entry)
 
 
-@bp.get("/<journalEntry:journal_entry>/edit", endpoint="edit")
+@bp.get("<journalEntry:journal_entry>/edit", endpoint="edit")
 @has_permission(can_edit)
 def show_journal_entry_edit_form(journal_entry: JournalEntry) -> str:
     """Shows the form to edit a journal entry.
@@ -133,7 +133,7 @@ def show_journal_entry_edit_form(journal_entry: JournalEntry) -> str:
     return journal_entry_op.render_edit_template(journal_entry, form)
 
 
-@bp.post("/<journalEntry:journal_entry>/update", endpoint="update")
+@bp.post("<journalEntry:journal_entry>/update", endpoint="update")
 @has_permission(can_edit)
 def update_journal_entry(journal_entry: JournalEntry) -> redirect:
     """Updates a journal entry.
@@ -166,7 +166,7 @@ def update_journal_entry(journal_entry: JournalEntry) -> redirect:
     return redirect(inherit_next(__get_detail_uri(journal_entry)))
 
 
-@bp.post("/<journalEntry:journal_entry>/delete", endpoint="delete")
+@bp.post("<journalEntry:journal_entry>/delete", endpoint="delete")
 @has_permission(can_edit)
 def delete_journal_entry(journal_entry: JournalEntry) -> redirect:
     """Deletes a journal entry.
@@ -186,7 +186,7 @@ def delete_journal_entry(journal_entry: JournalEntry) -> redirect:
     return redirect(or_next(__get_default_page_uri()))
 
 
-@bp.get("/dates/<date:journal_entry_date>", endpoint="order")
+@bp.get("dates/<date:journal_entry_date>", endpoint="order")
 @has_permission(can_view)
 def show_journal_entry_order(journal_entry_date: date) -> str:
     """Shows the order of the journal entries in a same date.
@@ -201,7 +201,7 @@ def show_journal_entry_order(journal_entry_date: date) -> str:
                            date=journal_entry_date, list=journal_entries)
 
 
-@bp.post("/dates/<date:journal_entry_date>", endpoint="sort")
+@bp.post("dates/<date:journal_entry_date>", endpoint="sort")
 @has_permission(can_edit)
 def sort_journal_entries(journal_entry_date: date) -> redirect:
     """Reorders the journal entries in a date.

src/accounting/report/utils/csv_export.py

@@ -22,6 +22,7 @@ from abc import ABC, abstractmethod
 from datetime import timedelta, date
 from decimal import Decimal
 from io import StringIO
+from urllib.parse import quote
 
 from flask import Response
 
@@ -53,7 +54,7 @@ def csv_download(filename: str, rows: list[BaseCSVRow]) -> Response:
         fp.seek(0)
         response: Response = Response(fp.read(), mimetype="text/csv")
         response.headers["Content-Disposition"] \
-            = f"attachment; filename={filename}"
+            = f"attachment; filename={quote(filename)}"
         return response
 
 

src/accounting/report/utils/urls.py

@@ -47,9 +47,10 @@ def ledger_url(currency: Currency, account: Account, period: Period) \
     :param period: The period.
     :return: The URL of the ledger.
     """
-    if period.is_default:
-        return url_for("accounting-report.ledger-default",
-                       currency=currency, account=account)
+    if currency.code == default_currency_code() \
+            and account.code == Account.CASH_CODE \
+            and period.is_default:
+        return url_for("accounting-report.ledger-default")
     return url_for("accounting-report.ledger",
                    currency=currency, account=account,
                    period=period)
@@ -68,9 +69,6 @@ def income_expenses_url(currency: Currency, account: CurrentAccount,
             and account.code == options.default_ie_account_code \
             and period.is_default:
         return url_for("accounting-report.default")
-    if period.is_default:
-        return url_for("accounting-report.income-expenses-default",
-                       currency=currency, account=account)
     return url_for("accounting-report.income-expenses",
                    currency=currency, account=account,
                    period=period)
@@ -83,9 +81,8 @@ def trial_balance_url(currency: Currency, period: Period) -> str:
     :param period: The period.
     :return: The URL of the trial balance.
     """
-    if period.is_default:
-        return url_for("accounting-report.trial-balance-default",
-                       currency=currency)
+    if currency.code == default_currency_code() and period.is_default:
+        return url_for("accounting-report.trial-balance-default")
     return url_for("accounting-report.trial-balance",
                    currency=currency, period=period)
 
@@ -97,9 +94,8 @@ def income_statement_url(currency: Currency, period: Period) -> str:
     :param period: The period.
     :return: The URL of the income statement.
     """
-    if period.is_default:
-        return url_for("accounting-report.income-statement-default",
-                       currency=currency)
+    if currency.code == default_currency_code() and period.is_default:
+        return url_for("accounting-report.income-statement-default")
     return url_for("accounting-report.income-statement",
                    currency=currency, period=period)
 
@@ -111,9 +107,8 @@ def balance_sheet_url(currency: Currency, period: Period) -> str:
     :param period: The period.
     :return: The URL of the balance sheet.
     """
-    if period.is_default:
-        return url_for("accounting-report.balance-sheet-default",
-                       currency=currency)
+    if currency.code == default_currency_code() and period.is_default:
+        return url_for("accounting-report.balance-sheet-default")
     return url_for("accounting-report.balance-sheet",
                    currency=currency, period=period)
 

src/accounting/report/views.py

@@ -44,10 +44,7 @@ def get_default_report() -> str | Response:
 
     :return: The income and expenses log in the default period.
     """
-    return __get_income_expenses(
-        db.session.get(Currency, default_currency_code()),
-        options.default_ie_account,
-        get_period())
+    return get_default_income_expenses()
 
 
 @bp.get("journal", endpoint="journal-default")
@@ -83,17 +80,15 @@ def __get_journal(period: Period) -> str | Response:
     return report.html()
 
 
-@bp.get("ledger/<currency:currency>/<account:account>",
-        endpoint="ledger-default")
+@bp.get("ledger", endpoint="ledger-default")
 @has_permission(can_view)
-def get_default_ledger(currency: Currency, account: Account) -> str | Response:
-    """Returns the ledger in the default period.
+def get_default_ledger() -> str | Response:
+    """Returns the ledger in the default currency, cash, and default period.
 
-    :param currency: The currency.
-    :param account: The account.
-    :return: The ledger in the default period.
+    :return: The ledger in the default currency, cash, and default period.
     """
-    return __get_ledger(currency, account, get_period())
+    return __get_ledger(db.session.get(Currency, default_currency_code()),
+                        Account.cash(), get_period())
 
 
 @bp.get("ledger/<currency:currency>/<account:account>/<period:period>",
@@ -126,18 +121,17 @@ def __get_ledger(currency: Currency, account: Account, period: Period) \
     return report.html()
 
 
-@bp.get("income-expenses/<currency:currency>/<currentAccount:account>",
-        endpoint="income-expenses-default")
+@bp.get("income-expenses", endpoint="income-expenses-default")
 @has_permission(can_view)
-def get_default_income_expenses(currency: Currency, account: CurrentAccount) \
-        -> str | Response:
+def get_default_income_expenses() -> str | Response:
     """Returns the income and expenses log in the default period.
 
-    :param currency: The currency.
-    :param account: The account.
     :return: The income and expenses log in the default period.
     """
-    return __get_income_expenses(currency, account, get_period())
+    return __get_income_expenses(
+        db.session.get(Currency, default_currency_code()),
+        options.default_ie_account,
+        get_period())
 
 
 @bp.get("income-expenses/<currency:currency>/<currentAccount:account>/"
@@ -170,16 +164,15 @@ def __get_income_expenses(currency: Currency, account: CurrentAccount,
     return report.html()
 
 
-@bp.get("trial-balance/<currency:currency>",
-        endpoint="trial-balance-default")
+@bp.get("trial-balance", endpoint="trial-balance-default")
 @has_permission(can_view)
-def get_default_trial_balance(currency: Currency) -> str | Response:
+def get_default_trial_balance() -> str | Response:
     """Returns the trial balance in the default period.
 
-    :param currency: The currency.
     :return: The trial balance in the default period.
     """
-    return __get_trial_balance(currency, get_period())
+    return __get_trial_balance(
+        db.session.get(Currency, default_currency_code()), get_period())
 
 
 @bp.get("trial-balance/<currency:currency>/<period:period>",
@@ -208,16 +201,15 @@ def __get_trial_balance(currency: Currency, period: Period) -> str | Response:
     return report.html()
 
 
-@bp.get("income-statement/<currency:currency>",
-        endpoint="income-statement-default")
+@bp.get("income-statement", endpoint="income-statement-default")
 @has_permission(can_view)
-def get_default_income_statement(currency: Currency) -> str | Response:
+def get_default_income_statement() -> str | Response:
     """Returns the income statement in the default period.
 
-    :param currency: The currency.
     :return: The income statement in the default period.
     """
-    return __get_income_statement(currency, get_period())
+    return __get_income_statement(
+        db.session.get(Currency, default_currency_code()), get_period())
 
 
 @bp.get("income-statement/<currency:currency>/<period:period>",
@@ -247,16 +239,15 @@ def __get_income_statement(currency: Currency, period: Period) \
     return report.html()
 
 
-@bp.get("balance-sheet/<currency:currency>",
-        endpoint="balance-sheet-default")
+@bp.get("balance-sheet", endpoint="balance-sheet-default")
 @has_permission(can_view)
-def get_default_balance_sheet(currency: Currency) -> str | Response:
+def get_default_balance_sheet() -> str | Response:
     """Returns the balance sheet in the default period.
 
-    :param currency: The currency.
     :return: The balance sheet in the default period.
     """
-    return __get_balance_sheet(currency, get_period())
+    return __get_balance_sheet(
+        db.session.get(Currency, default_currency_code()), get_period())
 
 
 @bp.get("balance-sheet/<currency:currency>/<period:period>",

tests/test_account.py

@@ -27,8 +27,8 @@ from flask import Flask
 from flask.testing import FlaskCliRunner
 
 from test_site import db
-from testlib import NEXT_URI, create_test_app, get_client, set_locale
-from testlib_journal_entry import add_journal_entry
+from testlib import NEXT_URI, create_test_app, get_client, set_locale, \
+    add_journal_entry
 
 
 class AccountData:

tests/test_currency.py

@@ -28,8 +28,8 @@ from flask import Flask
 from flask.testing import FlaskCliRunner
 
 from test_site import db
-from testlib import NEXT_URI, create_test_app, get_client, set_locale
-from testlib_journal_entry import add_journal_entry
+from testlib import NEXT_URI, create_test_app, get_client, set_locale, \
+    add_journal_entry
 
 
 class CurrencyData:

tests/test_description_editor.py

@@ -24,8 +24,8 @@ from click.testing import Result
 from flask import Flask
 from flask.testing import FlaskCliRunner
 
-from testlib import NEXT_URI, Accounts, create_test_app, get_client
-from testlib_journal_entry import add_journal_entry
+from testlib import NEXT_URI, Accounts, create_test_app, get_client, \
+    add_journal_entry
 
 
 class DescriptionEditorTestCase(unittest.TestCase):

tests/test_journal_entry.py

@@ -27,11 +27,12 @@ from flask import Flask
 from flask.testing import FlaskCliRunner
 
 from test_site import db
-from testlib import NEXT_URI, Accounts, create_test_app, get_client
+from testlib import NEXT_URI, Accounts, create_test_app, get_client, \
+    add_journal_entry, match_journal_entry_detail
 from testlib_journal_entry import NON_EMPTY_NOTE, EMPTY_NOTE, \
     get_add_form, get_unchanged_update_form, get_update_form, \
-    match_journal_entry_detail, set_negative_amount, \
-    remove_debit_in_a_currency, remove_credit_in_a_currency, add_journal_entry
+    set_negative_amount, remove_debit_in_a_currency, \
+    remove_credit_in_a_currency
 
 PREFIX: str = "/accounting/journal-entries"
 """The URL prefix for the journal entry management."""

tests/test_offset.py

@@ -17,6 +17,8 @@
 """The test for the offset.
 
 """
+from __future__ import annotations
+
 import unittest
 from decimal import Decimal
 
@@ -26,10 +28,9 @@ from flask import Flask
 from flask.testing import FlaskCliRunner
 
 from test_site import db
-from testlib import Accounts, create_test_app, get_client
-from testlib_journal_entry import match_journal_entry_detail
-from testlib_offset import TestData, JournalEntryLineItemData, \
-    JournalEntryData, CurrencyData
+from testlib import Accounts, create_test_app, get_client, \
+    match_journal_entry_detail, JournalEntryLineItemData, \
+    JournalEntryCurrencyData, JournalEntryData, BaseTestData
 
 PREFIX: str = "/accounting/journal-entries"
 """The URL prefix for the journal entry management."""
@@ -66,7 +67,8 @@ class OffsetTestCase(unittest.TestCase):
             JournalEntryLineItem.query.delete()
 
         self.client, self.csrf_token = get_client(self.app, "editor")
-        self.data: TestData = TestData(self.app, self.client, self.csrf_token)
+        self.data: OffsetTestData = OffsetTestData(
+            self.app, self.client, self.csrf_token)
 
     def test_add_receivable_offset(self) -> None:
         """Tests to add the receivable offset.
@@ -81,7 +83,7 @@ class OffsetTestCase(unittest.TestCase):
         response: httpx.Response
 
         journal_entry_data: JournalEntryData = JournalEntryData(
-            self.data.l_r_or3d.journal_entry.days, [CurrencyData(
+            self.data.l_r_or3d.journal_entry.days, [JournalEntryCurrencyData(
                 "USD",
                 [],
                 [JournalEntryLineItemData(
@@ -107,7 +109,7 @@ class OffsetTestCase(unittest.TestCase):
         # The same debit or credit
         form = journal_entry_data.new_form(self.csrf_token)
         form["currency-1-credit-1-original_line_item_id"] \
-            = self.data.l_p_or1c.id
+            = str(self.data.l_p_or1c.id)
         form["currency-1-credit-1-account_code"] = self.data.l_p_or1c.account
         form["currency-1-credit-1-amount"] = "100"
         response = self.client.post(store_uri, data=form)
@@ -131,7 +133,7 @@ class OffsetTestCase(unittest.TestCase):
         # The original line item is also an offset
         form = journal_entry_data.new_form(self.csrf_token)
         form["currency-1-credit-1-original_line_item_id"] \
-            = self.data.l_p_of1d.id
+            = str(self.data.l_p_of1d.id)
         form["currency-1-credit-1-account_code"] = self.data.l_p_of1d.account
         response = self.client.post(store_uri, data=form)
         self.assertEqual(response.status_code, 302)
@@ -217,7 +219,7 @@ class OffsetTestCase(unittest.TestCase):
         # The same debit or credit
         form = journal_entry_data.update_form(self.csrf_token)
         form["currency-1-credit-1-original_line_item_id"] \
-            = self.data.l_p_or1c.id
+            = str(self.data.l_p_or1c.id)
         form["currency-1-credit-1-account_code"] = self.data.l_p_or1c.account
         form["currency-1-debit-1-amount"] = "100"
         form["currency-1-credit-1-amount"] = "100"
@@ -242,7 +244,7 @@ class OffsetTestCase(unittest.TestCase):
         # The original line item is also an offset
         form = journal_entry_data.update_form(self.csrf_token)
         form["currency-1-credit-1-original_line_item_id"] \
-            = self.data.l_p_of1d.id
+            = str(self.data.l_p_of1d.id)
         form["currency-1-credit-1-account_code"] = self.data.l_p_of1d.account
         response = self.client.post(update_uri, data=form)
         self.assertEqual(response.status_code, 302)
@@ -405,7 +407,7 @@ class OffsetTestCase(unittest.TestCase):
         response: httpx.Response
 
         journal_entry_data: JournalEntryData = JournalEntryData(
-            self.data.l_p_or3c.journal_entry.days, [CurrencyData(
+            self.data.l_p_or3c.journal_entry.days, [JournalEntryCurrencyData(
                 "USD",
                 [JournalEntryLineItemData(
                     Accounts.PAYABLE,
@@ -431,7 +433,7 @@ class OffsetTestCase(unittest.TestCase):
         # The same debit or credit
         form = journal_entry_data.new_form(self.csrf_token)
         form["currency-1-debit-1-original_line_item_id"] \
-            = self.data.l_r_or1d.id
+            = str(self.data.l_r_or1d.id)
         form["currency-1-debit-1-account_code"] = self.data.l_r_or1d.account
         form["currency-1-debit-1-amount"] = "100"
         response = self.client.post(store_uri, data=form)
@@ -455,7 +457,7 @@ class OffsetTestCase(unittest.TestCase):
         # The original line item is also an offset
         form = journal_entry_data.new_form(self.csrf_token)
         form["currency-1-debit-1-original_line_item_id"] \
-            = self.data.l_r_of1c.id
+            = str(self.data.l_r_of1c.id)
         form["currency-1-debit-1-account_code"] = self.data.l_r_of1c.account
         response = self.client.post(store_uri, data=form)
         self.assertEqual(response.status_code, 302)
@@ -541,7 +543,7 @@ class OffsetTestCase(unittest.TestCase):
         # The same debit or credit
         form = journal_entry_data.update_form(self.csrf_token)
         form["currency-1-debit-1-original_line_item_id"] \
-            = self.data.l_r_or1d.id
+            = str(self.data.l_r_or1d.id)
         form["currency-1-debit-1-account_code"] = self.data.l_r_or1d.account
         form["currency-1-debit-1-amount"] = "100"
         form["currency-1-credit-1-amount"] = "100"
@@ -566,7 +568,7 @@ class OffsetTestCase(unittest.TestCase):
         # The original line item is also an offset
         form = journal_entry_data.update_form(self.csrf_token)
         form["currency-1-debit-1-original_line_item_id"] \
-            = self.data.l_r_of1c.id
+            = str(self.data.l_r_of1c.id)
         form["currency-1-debit-1-account_code"] = self.data.l_r_of1c.account
         response = self.client.post(update_uri, data=form)
         self.assertEqual(response.status_code, 302)
@@ -720,3 +722,114 @@ class OffsetTestCase(unittest.TestCase):
             self.assertIsNotNone(journal_entry_of)
             self.assertEqual(journal_entry_or.date, journal_entry_of.date)
             self.assertLess(journal_entry_or.no, journal_entry_of.no)
+
+
+class OffsetTestData(BaseTestData):
+    """The offset test data."""
+
+    def _init_data(self) -> None:
+        # Receivable original line items
+        self.l_r_or1d, self.l_r_or1c = self._couple(
+            "Accountant", "1200", Accounts.RECEIVABLE, Accounts.SERVICE)
+        self.l_r_or2d, self.l_r_or2c = self._couple(
+            "Toy", "600", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or3d, self.l_r_or3c = self._couple(
+            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or4d, self.l_r_or4c = self._couple(
+            "Interest", "3.4", Accounts.RECEIVABLE, Accounts.INTEREST)
+
+        # Payable original line items
+        self.l_p_or1d, self.l_p_or1c = self._couple(
+            "Airplane", "2000", Accounts.TRAVEL, Accounts.PAYABLE)
+        self.l_p_or2d, self.l_p_or2c = self._couple(
+            "Phone", "900", Accounts.OFFICE, Accounts.PAYABLE)
+        self.l_p_or3d, self.l_p_or3c = self._couple(
+            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or4d, self.l_p_or4c = self._couple(
+            "Envelop", "0.9", Accounts.OFFICE, Accounts.PAYABLE)
+
+        # Original journal entries
+        self.j_r_or1: JournalEntryData = JournalEntryData(
+            50, [JournalEntryCurrencyData(
+                "USD", [self.l_r_or1d, self.l_r_or4d],
+                [self.l_r_or1c, self.l_r_or4c])])
+        self.j_r_or2: JournalEntryData = JournalEntryData(
+            30, [JournalEntryCurrencyData(
+                "USD", [self.l_r_or2d, self.l_r_or3d],
+                [self.l_r_or2c, self.l_r_or3c])])
+        self.j_p_or1: JournalEntryData = JournalEntryData(
+            40, [JournalEntryCurrencyData(
+                "USD", [self.l_p_or1d, self.l_p_or4d],
+                [self.l_p_or1c, self.l_p_or4c])])
+        self.j_p_or2: JournalEntryData = JournalEntryData(
+            20, [JournalEntryCurrencyData(
+                "USD", [self.l_p_or2d, self.l_p_or3d],
+                [self.l_p_or2c, self.l_p_or3c])])
+
+        self._add_journal_entry(self.j_r_or1)
+        self._add_journal_entry(self.j_r_or2)
+        self._add_journal_entry(self.j_p_or1)
+        self._add_journal_entry(self.j_p_or2)
+
+        # Receivable offset items
+        self.l_r_of1d, self.l_r_of1c = self._couple(
+            "Accountant", "500", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of1c.original_line_item = self.l_r_or1d
+        self.l_r_of2d, self.l_r_of2c = self._couple(
+            "Accountant", "200", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of2c.original_line_item = self.l_r_or1d
+        self.l_r_of3d, self.l_r_of3c = self._couple(
+            "Accountant", "100", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of3c.original_line_item = self.l_r_or1d
+        self.l_r_of4d, self.l_r_of4c = self._couple(
+            "Toy", "240", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of4c.original_line_item = self.l_r_or2d
+        self.l_r_of5d, self.l_r_of5c = self._couple(
+            "Interest", "3.4", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of5c.original_line_item = self.l_r_or4d
+
+        # Payable offset items
+        self.l_p_of1d, self.l_p_of1c = self._couple(
+            "Airplane", "800", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of1d.original_line_item = self.l_p_or1c
+        self.l_p_of2d, self.l_p_of2c = self._couple(
+            "Airplane", "300", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of2d.original_line_item = self.l_p_or1c
+        self.l_p_of3d, self.l_p_of3c = self._couple(
+            "Airplane", "100", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of3d.original_line_item = self.l_p_or1c
+        self.l_p_of4d, self.l_p_of4c = self._couple(
+            "Phone", "400", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of4d.original_line_item = self.l_p_or2c
+        self.l_p_of5d, self.l_p_of5c = self._couple(
+            "Envelop", "0.9", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of5d.original_line_item = self.l_p_or4c
+
+        # Offset journal entries
+        self.j_r_of1: JournalEntryData = JournalEntryData(
+            25, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of1d], [self.l_r_of1c])])
+        self.j_r_of2: JournalEntryData = JournalEntryData(
+            20, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of2d, self.l_r_of3d, self.l_r_of4d],
+                [self.l_r_of2c, self.l_r_of3c, self.l_r_of4c])])
+        self.j_r_of3: JournalEntryData = JournalEntryData(
+            15, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of5d], [self.l_r_of5c])])
+        self.j_p_of1: JournalEntryData = JournalEntryData(
+            15, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of1d], [self.l_p_of1c])])
+        self.j_p_of2: JournalEntryData = JournalEntryData(
+            10, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of2d, self.l_p_of3d, self.l_p_of4d],
+                [self.l_p_of2c, self.l_p_of3c, self.l_p_of4c])])
+        self.j_p_of3: JournalEntryData = JournalEntryData(
+            5, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of5d], [self.l_p_of5c])])
+
+        self._add_journal_entry(self.j_r_of1)
+        self._add_journal_entry(self.j_r_of2)
+        self._add_journal_entry(self.j_r_of3)
+        self._add_journal_entry(self.j_p_of1)
+        self._add_journal_entry(self.j_p_of2)
+        self._add_journal_entry(self.j_p_of3)

tests/test_option.py

@@ -27,7 +27,6 @@ from flask.testing import FlaskCliRunner
 
 from test_site import db
 from testlib import NEXT_URI, Accounts, create_test_app, get_client
-from testlib_offset import TestData
 
 PREFIX: str = "/accounting/options"
 """The URL prefix for the option management."""
@@ -68,7 +67,6 @@ class OptionTestCase(unittest.TestCase):
             Option.query.delete()
 
         self.client, self.csrf_token = get_client(self.app, "admin")
-        self.data: TestData = TestData(self.app, self.client, self.csrf_token)
 
     def test_nobody(self) -> None:
         """Test the permission as nobody.

tests/test_report.py

@@ -0,0 +1,415 @@
+# The Mia! Accounting Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/9
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The test for the reports.
+
+"""
+import unittest
+from datetime import date
+
+import httpx
+from click.testing import Result
+from flask import Flask
+from flask.testing import FlaskCliRunner
+
+from testlib import create_test_app, get_client, Accounts, BaseTestData
+
+PREFIX: str = "/accounting"
+"""The URL prefix for the reports."""
+CSV_MIME: str = "text/csv; charset=utf-8"
+"""The MIME type of the downloaded CSV files."""
+
+
+class ReportTestCase(unittest.TestCase):
+    """The report test case."""
+
+    def setUp(self) -> None:
+        """Sets up the test.
+        This is run once per test.
+
+        :return: None.
+        """
+        self.app: Flask = create_test_app()
+
+        runner: FlaskCliRunner = self.app.test_cli_runner()
+        with self.app.app_context():
+            from accounting.models import BaseAccount, JournalEntry, \
+                JournalEntryLineItem
+            result: Result
+            result = runner.invoke(args="init-db")
+            self.assertEqual(result.exit_code, 0)
+            if BaseAccount.query.first() is None:
+                result = runner.invoke(args="accounting-init-base")
+                self.assertEqual(result.exit_code, 0)
+            result = runner.invoke(args=["accounting-init-currencies",
+                                         "-u", "editor"])
+            self.assertEqual(result.exit_code, 0)
+            result = runner.invoke(args=["accounting-init-accounts",
+                                         "-u", "editor"])
+            self.assertEqual(result.exit_code, 0)
+            JournalEntry.query.delete()
+            JournalEntryLineItem.query.delete()
+
+        self.client, self.csrf_token = get_client(self.app, "editor")
+
+    def test_nobody(self) -> None:
+        """Test the permission as nobody.
+
+        :return: None.
+        """
+        client, csrf_token = get_client(self.app, "nobody")
+        ReportTestData(self.app, self.client, self.csrf_token)
+        response: httpx.Response
+
+        response = client.get(PREFIX)
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/journal")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/journal?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/ledger")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/ledger?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/income-expenses")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/income-expenses?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/trial-balance")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/trial-balance?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/income-statement")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/income-statement?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/balance-sheet")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/balance-sheet?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/unapplied")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/unapplied?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/unapplied/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/unapplied/{Accounts.PAYABLE}?as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/search?q=Salary")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/search?q=Salary&as=csv")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/search?q=薪水")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/search?q=薪水&as=csv")
+        self.assertEqual(response.status_code, 403)
+
+    def test_viewer(self) -> None:
+        """Test the permission as viewer.
+
+        :return: None.
+        """
+        client, csrf_token = get_client(self.app, "viewer")
+        ReportTestData(self.app, self.client, self.csrf_token)
+        response: httpx.Response
+
+        response = client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/journal")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/journal?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/ledger")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/ledger?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/income-expenses")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/income-expenses?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/trial-balance")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/trial-balance?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/income-statement")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/income-statement?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/balance-sheet")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/balance-sheet?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/unapplied")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/unapplied?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/unapplied/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/unapplied/{Accounts.PAYABLE}?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/search?q=Salary")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/search?q=Salary&as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = client.get(f"{PREFIX}/search?q=薪水")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/search?q=薪水&as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+    def test_editor(self) -> None:
+        """Test the permission as editor.
+
+        :return: None.
+        """
+        ReportTestData(self.app, self.client, self.csrf_token)
+        response: httpx.Response
+
+        response = self.client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/journal")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/journal?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/ledger")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/ledger?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/income-expenses")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/income-expenses?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/trial-balance")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/trial-balance?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/income-statement")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/income-statement?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/balance-sheet")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/balance-sheet?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/unapplied")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/unapplied?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/unapplied/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(
+            f"{PREFIX}/unapplied/{Accounts.PAYABLE}?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/search?q=Salary")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/search?q=Salary&as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/search?q=薪水")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/search?q=薪水&as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+    def test_empty_db(self) -> None:
+        """Tests the empty database.
+
+        :return: None.
+        """
+        response: httpx.Response
+
+        response = self.client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/journal")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/journal?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/ledger")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/ledger?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/income-expenses")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/income-expenses?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/trial-balance")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/trial-balance?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/income-statement")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/income-statement?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/balance-sheet")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/balance-sheet?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/unapplied")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/unapplied?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/unapplied/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(
+            f"{PREFIX}/unapplied/{Accounts.PAYABLE}?as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+        response = self.client.get(f"{PREFIX}/search?q=Salary")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/search?q=Salary&as=csv")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.headers["Content-Type"], CSV_MIME)
+
+
+class ReportTestData(BaseTestData):
+    """The report test data."""
+
+    def _init_data(self) -> None:
+        today: date = date.today()
+        year: int = today.year - 5
+        month: int = today.month
+        while True:
+            j_date: date = date(year, month, 5)
+            if j_date > today:
+                break
+            self._add_simple_journal_entry(
+                (j_date - today).days, "USD",
+                "Salary薪水", "1200", Accounts.BANK, Accounts.SERVICE)
+            month = month + 1
+            if month > 12:
+                year = year + 1
+                month = 1
+        self._add_simple_journal_entry(
+            1, "USD", "Withdraw領錢", "1000", Accounts.CASH, Accounts.BANK)
+        self._add_simple_journal_entry(
+            0, "USD", "Dinner晚餐", "40", Accounts.MEAL, Accounts.CASH)

tests/test_unmatched_offset.py

@@ -1,5 +1,5 @@
 # The Mia! Accounting Project.
-# Author: imacat@mail.imacat.idv.tw (imacat), 2023/3/11
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/8
 
 #  Copyright (c) 2023 imacat.
 #
@@ -14,7 +14,7 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-"""The test for the offset matcher.
+"""The test for the unmatched offsets.
 
 """
 import unittest
@@ -25,14 +25,15 @@ from flask import Flask
 from flask.testing import FlaskCliRunner
 
 from test_site import db
-from testlib import create_test_app, get_client, Accounts
-from testlib_journal_entry import match_journal_entry_detail
-from testlib_offset import JournalEntryData, CurrencyData, \
-    JournalEntryLineItemData
+from testlib import create_test_app, get_client, Accounts, \
+    JournalEntryCurrencyData, JournalEntryData, BaseTestData
+
+PREFIX: str = "/accounting/unmatched-offsets"
+"""The URL prefix for the unmatched offset management."""
 
 
-class OffsetMatcherTestCase(unittest.TestCase):
-    """The offset matcher test case."""
+class UnmatchedOffsetTestCase(unittest.TestCase):
+    """The unmatched offset test case."""
 
     def setUp(self) -> None:
         """Sets up the test.
@@ -63,6 +64,83 @@ class OffsetMatcherTestCase(unittest.TestCase):
 
         self.client, self.csrf_token = get_client(self.app, "editor")
 
+    def test_nobody(self) -> None:
+        """Test the permission as nobody.
+
+        :return: None.
+        """
+        client, csrf_token = get_client(self.app, "nobody")
+        DifferentTestData(self.app, self.client, self.csrf_token)
+        response: httpx.Response
+
+        response = client.get(PREFIX)
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/{Accounts.PAYABLE}",
+                               data={"csrf_token": csrf_token})
+        self.assertEqual(response.status_code, 403)
+
+    def test_viewer(self) -> None:
+        """Test the permission as viewer.
+
+        :return: None.
+        """
+        client, csrf_token = get_client(self.app, "viewer")
+        DifferentTestData(self.app, self.client, self.csrf_token)
+        response: httpx.Response
+
+        response = client.get(PREFIX)
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/{Accounts.PAYABLE}",
+                               data={"csrf_token": csrf_token})
+        self.assertEqual(response.status_code, 403)
+
+    def test_editor(self) -> None:
+        """Test the permission as editor.
+
+        :return: None.
+        """
+        DifferentTestData(self.app, self.client, self.csrf_token)
+        response: httpx.Response
+
+        response = self.client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(f"{PREFIX}/{Accounts.PAYABLE}",
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"],
+                         f"{PREFIX}/{Accounts.PAYABLE}")
+
+    def test_empty_db(self) -> None:
+        """Test the empty database.
+
+        :return: None.
+        """
+        response: httpx.Response
+
+        response = self.client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/{Accounts.PAYABLE}")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(f"{PREFIX}/{Accounts.PAYABLE}",
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"],
+                         f"{PREFIX}/{Accounts.PAYABLE}")
+
     def test_different(self) -> None:
         """Tests to match against different descriptions and amounts.
 
@@ -76,6 +154,7 @@ class OffsetMatcherTestCase(unittest.TestCase):
         line_item: JournalEntryLineItem | None
         matcher: OffsetMatcher
         list_uri: str
+        match_uri: str
         response: httpx.Response
 
         # The receivables
@@ -100,8 +179,9 @@ class OffsetMatcherTestCase(unittest.TestCase):
                 self.assertIsNotNone(line_item)
                 self.assertIsNone(line_item.original_line_item_id)
 
-        list_uri = f"/accounting/unmatched-offsets/{Accounts.RECEIVABLE}"
-        response = self.client.post(list_uri,
+        list_uri = f"{PREFIX}/{Accounts.RECEIVABLE}"
+        match_uri = f"{PREFIX}/{Accounts.RECEIVABLE}"
+        response = self.client.post(match_uri,
                                     data={"csrf_token": self.csrf_token})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"], list_uri)
@@ -149,8 +229,9 @@ class OffsetMatcherTestCase(unittest.TestCase):
                 self.assertIsNotNone(line_item)
                 self.assertIsNone(line_item.original_line_item_id)
 
-        list_uri = f"/accounting/unmatched-offsets/{Accounts.PAYABLE}"
-        response = self.client.post(list_uri,
+        list_uri = f"{PREFIX}/{Accounts.PAYABLE}"
+        match_uri = f"{PREFIX}/{Accounts.PAYABLE}"
+        response = self.client.post(match_uri,
                                     data={"csrf_token": self.csrf_token})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"], list_uri)
@@ -189,6 +270,7 @@ class OffsetMatcherTestCase(unittest.TestCase):
         line_item: JournalEntryLineItem | None
         matcher: OffsetMatcher
         list_uri: str
+        match_uri: str
         response: httpx.Response
 
         # The receivables
@@ -220,8 +302,9 @@ class OffsetMatcherTestCase(unittest.TestCase):
             self.assertIsNotNone(line_item.original_line_item_id)
             self.assertEqual(line_item.original_line_item_id, data.l_r_or2d.id)
 
-        list_uri = f"/accounting/unmatched-offsets/{Accounts.RECEIVABLE}"
-        response = self.client.post(list_uri,
+        list_uri = f"{PREFIX}/{Accounts.RECEIVABLE}"
+        match_uri = f"{PREFIX}/{Accounts.RECEIVABLE}"
+        response = self.client.post(match_uri,
                                     data={"csrf_token": self.csrf_token})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"], list_uri)
@@ -285,8 +368,9 @@ class OffsetMatcherTestCase(unittest.TestCase):
             self.assertIsNotNone(line_item.original_line_item_id)
             self.assertEqual(line_item.original_line_item_id, data.l_p_or2c.id)
 
-        list_uri = f"/accounting/unmatched-offsets/{Accounts.PAYABLE}"
-        response = self.client.post(list_uri,
+        list_uri = f"{PREFIX}/{Accounts.PAYABLE}"
+        match_uri = f"{PREFIX}/{Accounts.PAYABLE}"
+        response = self.client.post(match_uri,
                                     data={"csrf_token": self.csrf_token})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"], list_uri)
@@ -322,371 +406,179 @@ class OffsetMatcherTestCase(unittest.TestCase):
             self.assertEqual(line_item.original_line_item_id, data.l_p_or4c.id)
 
 
-class DifferentTestData:
+class DifferentTestData(BaseTestData):
     """The test data for different descriptions and amounts."""
 
-    def __init__(self, app: Flask, client: httpx.Client, csrf_token: str):
-        """Constructs the test data.
-
-        :param app: The Flask application.
-        :param client: The client.
-        :param csrf_token: The CSRF token.
-        """
-        self.app: Flask = app
-        self.client: httpx.Client = client
-        self.csrf_token: str = csrf_token
-
-        def couple(description: str, amount: str, debit: str, credit: str) \
-                -> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
-            """Returns a couple of debit-credit line items.
-
-            :param description: The description.
-            :param amount: The amount.
-            :param debit: The debit account code.
-            :param credit: The credit account code.
-            :return: The debit line item and credit line item.
-            """
-            return JournalEntryLineItemData(debit, description, amount),\
-                JournalEntryLineItemData(credit, description, amount)
-
+    def _init_data(self) -> None:
         # Receivable original line items
-        self.l_r_or1d, self.l_r_or1c = couple(
+        self.l_r_or1d, self.l_r_or1c = self._couple(
             "Accountant", "1200", Accounts.RECEIVABLE, Accounts.SERVICE)
-        self.l_r_or2d, self.l_r_or2c = couple(
+        self.l_r_or2d, self.l_r_or2c = self._couple(
             "Toy", "600", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or3d, self.l_r_or3c = couple(
+        self.l_r_or3d, self.l_r_or3c = self._couple(
             "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or4d, self.l_r_or4c = couple(
+        self.l_r_or4d, self.l_r_or4c = self._couple(
             "Interest", "3.4", Accounts.RECEIVABLE, Accounts.INTEREST)
 
         # Payable original line items
-        self.l_p_or1d, self.l_p_or1c = couple(
+        self.l_p_or1d, self.l_p_or1c = self._couple(
             "Airplane", "2000", Accounts.TRAVEL, Accounts.PAYABLE)
-        self.l_p_or2d, self.l_p_or2c = couple(
+        self.l_p_or2d, self.l_p_or2c = self._couple(
             "Phone", "900", Accounts.OFFICE, Accounts.PAYABLE)
-        self.l_p_or3d, self.l_p_or3c = couple(
+        self.l_p_or3d, self.l_p_or3c = self._couple(
             "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or4d, self.l_p_or4c = couple(
+        self.l_p_or4d, self.l_p_or4c = self._couple(
             "Envelop", "0.9", Accounts.OFFICE, Accounts.PAYABLE)
 
         # Original journal entries
         self.j_r_or1: JournalEntryData = JournalEntryData(
-            50, [CurrencyData("USD", [self.l_r_or1d, self.l_r_or4d],
+            50, [JournalEntryCurrencyData(
+                "USD", [self.l_r_or1d, self.l_r_or4d],
                 [self.l_r_or1c, self.l_r_or4c])])
         self.j_r_or2: JournalEntryData = JournalEntryData(
-            30, [CurrencyData("USD", [self.l_r_or2d, self.l_r_or3d],
+            30, [JournalEntryCurrencyData(
+                "USD", [self.l_r_or2d, self.l_r_or3d],
                 [self.l_r_or2c, self.l_r_or3c])])
         self.j_p_or1: JournalEntryData = JournalEntryData(
-            40, [CurrencyData("USD", [self.l_p_or1d, self.l_p_or4d],
+            40, [JournalEntryCurrencyData(
+                "USD", [self.l_p_or1d, self.l_p_or4d],
                 [self.l_p_or1c, self.l_p_or4c])])
         self.j_p_or2: JournalEntryData = JournalEntryData(
-            20, [CurrencyData("USD", [self.l_p_or2d, self.l_p_or3d],
+            20, [JournalEntryCurrencyData(
+                "USD", [self.l_p_or2d, self.l_p_or3d],
                 [self.l_p_or2c, self.l_p_or3c])])
 
-        self.__add_journal_entry(self.j_r_or1)
-        self.__add_journal_entry(self.j_r_or2)
-        self.__add_journal_entry(self.j_p_or1)
-        self.__add_journal_entry(self.j_p_or2)
+        self._add_journal_entry(self.j_r_or1)
+        self._add_journal_entry(self.j_r_or2)
+        self._add_journal_entry(self.j_p_or1)
+        self._add_journal_entry(self.j_p_or2)
 
         # Receivable offset items
-        self.l_r_of1d, self.l_r_of1c = couple(
+        self.l_r_of1d, self.l_r_of1c = self._couple(
             "Accountant", "500", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of2d, self.l_r_of2c = couple(
+        self.l_r_of2d, self.l_r_of2c = self._couple(
             "Accountant", "200", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of3d, self.l_r_of3c = couple(
+        self.l_r_of3d, self.l_r_of3c = self._couple(
             "Accountant", "100", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of4d, self.l_r_of4c = couple(
+        self.l_r_of4d, self.l_r_of4c = self._couple(
             "Toy", "240", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of5d, self.l_r_of5c = couple(
+        self.l_r_of5d, self.l_r_of5c = self._couple(
             "Interest", "3.4", Accounts.CASH, Accounts.RECEIVABLE)
 
         # Payable offset items
-        self.l_p_of1d, self.l_p_of1c = couple(
+        self.l_p_of1d, self.l_p_of1c = self._couple(
             "Airplane", "800", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of2d, self.l_p_of2c = couple(
+        self.l_p_of2d, self.l_p_of2c = self._couple(
             "Airplane", "300", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of3d, self.l_p_of3c = couple(
+        self.l_p_of3d, self.l_p_of3c = self._couple(
             "Airplane", "100", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of4d, self.l_p_of4c = couple(
+        self.l_p_of4d, self.l_p_of4c = self._couple(
             "Phone", "400", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of5d, self.l_p_of5c = couple(
+        self.l_p_of5d, self.l_p_of5c = self._couple(
             "Envelop", "0.9", Accounts.PAYABLE, Accounts.CASH)
 
         # Offset journal entries
         self.j_r_of1: JournalEntryData = JournalEntryData(
-            25, [CurrencyData("USD", [self.l_r_of1d], [self.l_r_of1c])])
+            25, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of1d], [self.l_r_of1c])])
         self.j_r_of2: JournalEntryData = JournalEntryData(
-            20, [CurrencyData("USD",
-                              [self.l_r_of2d, self.l_r_of3d, self.l_r_of4d],
+            20, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of2d, self.l_r_of3d, self.l_r_of4d],
                 [self.l_r_of2c, self.l_r_of3c, self.l_r_of4c])])
         self.j_r_of3: JournalEntryData = JournalEntryData(
-            15, [CurrencyData("USD", [self.l_r_of5d], [self.l_r_of5c])])
+            15, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of5d], [self.l_r_of5c])])
         self.j_p_of1: JournalEntryData = JournalEntryData(
-            15, [CurrencyData("USD", [self.l_p_of1d], [self.l_p_of1c])])
+            15, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of1d], [self.l_p_of1c])])
         self.j_p_of2: JournalEntryData = JournalEntryData(
-            10, [CurrencyData("USD",
-                              [self.l_p_of2d, self.l_p_of3d, self.l_p_of4d],
+            10, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of2d, self.l_p_of3d, self.l_p_of4d],
                 [self.l_p_of2c, self.l_p_of3c, self.l_p_of4c])])
         self.j_p_of3: JournalEntryData = JournalEntryData(
-            5, [CurrencyData("USD", [self.l_p_of5d], [self.l_p_of5c])])
+            5, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of5d], [self.l_p_of5c])])
 
-        self.__set_is_need_offset(False)
-        self.__add_journal_entry(self.j_r_of1)
-        self.__add_journal_entry(self.j_r_of2)
-        self.__add_journal_entry(self.j_r_of3)
-        self.__add_journal_entry(self.j_p_of1)
-        self.__add_journal_entry(self.j_p_of2)
-        self.__add_journal_entry(self.j_p_of3)
-        self.__set_is_need_offset(True)
-
-    def __set_is_need_offset(self, is_need_offset: bool) -> None:
-        """Sets whether the payables and receivables need offset.
-
-        :param is_need_offset: True if payables and receivables need offset, or
-            False otherwise.
-        :return:
-        """
-        from accounting.models import Account
-        with self.app.app_context():
-            for code in {Accounts.RECEIVABLE, Accounts.PAYABLE}:
-                account: Account | None = Account.find_by_code(code)
-                assert account is not None
-                account.is_need_offset = is_need_offset
-            db.session.commit()
-
-    def __add_journal_entry(self, journal_entry_data: JournalEntryData) \
-            -> None:
-        """Adds a journal entry.
-
-        :param journal_entry_data: The journal entry data.
-        :return: None.
-        """
-        from accounting.models import JournalEntry
-        store_uri: str = "/accounting/journal-entries/store/transfer"
-
-        response: httpx.Response = self.client.post(
-            store_uri, data=journal_entry_data.new_form(self.csrf_token))
-        assert response.status_code == 302
-        journal_entry_id: int \
-            = match_journal_entry_detail(response.headers["Location"])
-        journal_entry_data.id = journal_entry_id
-        with self.app.app_context():
-            journal_entry: JournalEntry | None \
-                = db.session.get(JournalEntry, journal_entry_id)
-            assert journal_entry is not None
-            for i in range(len(journal_entry.currencies)):
-                for j in range(len(journal_entry.currencies[i].debit)):
-                    journal_entry_data.currencies[i].debit[j].id \
-                        = journal_entry.currencies[i].debit[j].id
-                for j in range(len(journal_entry.currencies[i].credit)):
-                    journal_entry_data.currencies[i].credit[j].id \
-                        = journal_entry.currencies[i].credit[j].id
+        self._set_need_offset({Accounts.RECEIVABLE, Accounts.PAYABLE}, False)
+        self._add_journal_entry(self.j_r_of1)
+        self._add_journal_entry(self.j_r_of2)
+        self._add_journal_entry(self.j_r_of3)
+        self._add_journal_entry(self.j_p_of1)
+        self._add_journal_entry(self.j_p_of2)
+        self._add_journal_entry(self.j_p_of3)
+        self._set_need_offset({Accounts.RECEIVABLE, Accounts.PAYABLE}, True)
 
 
-class SameTestData:
+class SameTestData(BaseTestData):
     """The test data with same descriptions and amounts."""
 
-    def __init__(self, app: Flask, client: httpx.Client, csrf_token: str):
-        """Constructs the test data.
-
-        :param app: The Flask application.
-        :param client: The client.
-        :param csrf_token: The CSRF token.
-        """
-        self.app: Flask = app
-        self.client: httpx.Client = client
-        self.csrf_token: str = csrf_token
-
-        def couple(description: str, amount: str, debit: str, credit: str) \
-                -> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
-            """Returns a couple of debit-credit line items.
-
-            :param description: The description.
-            :param amount: The amount.
-            :param debit: The debit account code.
-            :param credit: The credit account code.
-            :return: The debit line item and credit line item.
-            """
-            return JournalEntryLineItemData(debit, description, amount),\
-                JournalEntryLineItemData(credit, description, amount)
-
+    def _init_data(self) -> None:
         # Receivable original line items
-        self.l_r_or1d, self.l_r_or1c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or2d, self.l_r_or2c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or3d, self.l_r_or3c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or4d, self.l_r_or4c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or5d, self.l_r_or5c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or6d, self.l_r_or6c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or1d, self.l_r_or1c = self._add_simple_journal_entry(
+            60, "USD", "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or2d, self.l_r_or2c = self._add_simple_journal_entry(
+            50, "USD", "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or3d, self.l_r_or3c = self._add_simple_journal_entry(
+            40, "USD", "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or4d, self.l_r_or4c = self._add_simple_journal_entry(
+            30, "USD", "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or5d, self.l_r_or5c = self._add_simple_journal_entry(
+            20, "USD", "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
+        self.l_r_or6d, self.l_r_or6c = self._add_simple_journal_entry(
+            10, "USD", "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
 
         # Payable original line items
-        self.l_p_or1d, self.l_p_or1c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or2d, self.l_p_or2c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or3d, self.l_p_or3c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or4d, self.l_p_or4c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or5d, self.l_p_or5c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or6d, self.l_p_or6c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or1d, self.l_p_or1c = self._add_simple_journal_entry(
+            60, "USD", "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or2d, self.l_p_or2c = self._add_simple_journal_entry(
+            50, "USD", "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or3d, self.l_p_or3c = self._add_simple_journal_entry(
+            40, "USD", "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or4d, self.l_p_or4c = self._add_simple_journal_entry(
+            30, "USD", "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or5d, self.l_p_or5c = self._add_simple_journal_entry(
+            20, "USD", "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
+        self.l_p_or6d, self.l_p_or6c = self._add_simple_journal_entry(
+            10, "USD", "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
 
-        # Original journal entries
-        self.j_r_or1: JournalEntryData = JournalEntryData(
-            60, [CurrencyData("USD", [self.l_r_or1d], [self.l_r_or1c])])
-        self.j_r_or2: JournalEntryData = JournalEntryData(
-            50, [CurrencyData("USD", [self.l_r_or2d], [self.l_r_or2c])])
-        self.j_r_or3: JournalEntryData = JournalEntryData(
-            40, [CurrencyData("USD", [self.l_r_or3d], [self.l_r_or3c])])
-        self.j_r_or4: JournalEntryData = JournalEntryData(
-            30, [CurrencyData("USD", [self.l_r_or4d], [self.l_r_or4c])])
-        self.j_r_or5: JournalEntryData = JournalEntryData(
-            20, [CurrencyData("USD", [self.l_r_or5d], [self.l_r_or5c])])
-        self.j_r_or6: JournalEntryData = JournalEntryData(
-            10, [CurrencyData("USD", [self.l_r_or6d], [self.l_r_or6c])])
-        self.j_p_or1: JournalEntryData = JournalEntryData(
-            60, [CurrencyData("USD", [self.l_p_or1d], [self.l_p_or1c])])
-        self.j_p_or2: JournalEntryData = JournalEntryData(
-            50, [CurrencyData("USD", [self.l_p_or2d], [self.l_p_or2c])])
-        self.j_p_or3: JournalEntryData = JournalEntryData(
-            40, [CurrencyData("USD", [self.l_p_or3d], [self.l_p_or3c])])
-        self.j_p_or4: JournalEntryData = JournalEntryData(
-            30, [CurrencyData("USD", [self.l_p_or4d], [self.l_p_or4c])])
-        self.j_p_or5: JournalEntryData = JournalEntryData(
-            20, [CurrencyData("USD", [self.l_p_or5d], [self.l_p_or5c])])
-        self.j_p_or6: JournalEntryData = JournalEntryData(
-            10, [CurrencyData("USD", [self.l_p_or6d], [self.l_p_or6c])])
-
-        self.__add_journal_entry(self.j_r_or1)
-        self.__add_journal_entry(self.j_r_or2)
-        self.__add_journal_entry(self.j_r_or3)
-        self.__add_journal_entry(self.j_r_or4)
-        self.__add_journal_entry(self.j_r_or5)
-        self.__add_journal_entry(self.j_r_or6)
-        self.__add_journal_entry(self.j_p_or1)
-        self.__add_journal_entry(self.j_p_or2)
-        self.__add_journal_entry(self.j_p_or3)
-        self.__add_journal_entry(self.j_p_or4)
-        self.__add_journal_entry(self.j_p_or5)
-        self.__add_journal_entry(self.j_p_or6)
+        self._set_need_offset({Accounts.RECEIVABLE, Accounts.PAYABLE}, False)
 
         # Receivable offset items
-        self.l_r_of1d, self.l_r_of1c = couple(
-            "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of2d, self.l_r_of2c = couple(
-            "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of3d, self.l_r_of3c = couple(
+        self.l_r_of1d, self.l_r_of1c = self._add_simple_journal_entry(
+            65, "USD", "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of2d, self.l_r_of2c = self._add_simple_journal_entry(
+            35, "USD", "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of3d, self.l_r_of3c = self._couple(
             "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
         self.l_r_of3c.original_line_item = self.l_r_or2d
-        self.l_r_of4d, self.l_r_of4c = couple(
-            "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of5d, self.l_r_of5c = couple(
-            "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of6d, self.l_r_of6c = couple(
-            "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
+        j_r_of3: JournalEntryData = JournalEntryData(
+            35, [JournalEntryCurrencyData(
+                "USD", [self.l_r_of3d], [self.l_r_of3c])])
+        self.l_r_of4d, self.l_r_of4c = self._add_simple_journal_entry(
+            35, "USD", "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of5d, self.l_r_of5c = self._add_simple_journal_entry(
+            35, "USD", "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
+        self.l_r_of6d, self.l_r_of6c = self._add_simple_journal_entry(
+            15, "USD", "Noodles", "100", Accounts.CASH, Accounts.RECEIVABLE)
 
         # Payable offset items
-        self.l_p_of1d, self.l_p_of1c = couple(
-            "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of2d, self.l_p_of2c = couple(
-            "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of3d, self.l_p_of3c = couple(
+        self.l_p_of1d, self.l_p_of1c = self._add_simple_journal_entry(
+            65, "USD", "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of2d, self.l_p_of2c = self._add_simple_journal_entry(
+            35, "USD", "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of3d, self.l_p_of3c = self._couple(
             "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
         self.l_p_of3d.original_line_item = self.l_p_or2c
-        self.l_p_of4d, self.l_p_of4c = couple(
-            "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of5d, self.l_p_of5c = couple(
-            "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of6d, self.l_p_of6c = couple(
-            "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
+        j_p_of3: JournalEntryData = JournalEntryData(
+            35, [JournalEntryCurrencyData(
+                "USD", [self.l_p_of3d], [self.l_p_of3c])])
+        self.l_p_of4d, self.l_p_of4c = self._add_simple_journal_entry(
+            35, "USD", "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of5d, self.l_p_of5c = self._add_simple_journal_entry(
+            35, "USD", "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
+        self.l_p_of6d, self.l_p_of6c = self._add_simple_journal_entry(
+            15, "USD", "Steak", "120", Accounts.PAYABLE, Accounts.CASH)
 
-        # Offset journal entries
-        self.j_r_of1: JournalEntryData = JournalEntryData(
-            65, [CurrencyData("USD", [self.l_r_of1d], [self.l_r_of1c])])
-        self.j_r_of2: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_r_of2d], [self.l_r_of2c])])
-        self.j_r_of3: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_r_of3d], [self.l_r_of3c])])
-        self.j_r_of4: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_r_of4d], [self.l_r_of4c])])
-        self.j_r_of5: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_r_of5d], [self.l_r_of5c])])
-        self.j_r_of6: JournalEntryData = JournalEntryData(
-            15, [CurrencyData("USD", [self.l_r_of6d], [self.l_r_of6c])])
-        self.j_p_of1: JournalEntryData = JournalEntryData(
-            65, [CurrencyData("USD", [self.l_p_of1d], [self.l_p_of1c])])
-        self.j_p_of2: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_p_of2d], [self.l_p_of2c])])
-        self.j_p_of3: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_p_of3d], [self.l_p_of3c])])
-        self.j_p_of4: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_p_of4d], [self.l_p_of4c])])
-        self.j_p_of5: JournalEntryData = JournalEntryData(
-            35, [CurrencyData("USD", [self.l_p_of5d], [self.l_p_of5c])])
-        self.j_p_of6: JournalEntryData = JournalEntryData(
-            15, [CurrencyData("USD", [self.l_p_of6d], [self.l_p_of6c])])
-
-        self.__set_is_need_offset(False)
-        self.__add_journal_entry(self.j_r_of1)
-        self.__add_journal_entry(self.j_r_of2)
-        self.__add_journal_entry(self.j_r_of4)
-        self.__add_journal_entry(self.j_r_of5)
-        self.__add_journal_entry(self.j_r_of6)
-        self.__add_journal_entry(self.j_p_of1)
-        self.__add_journal_entry(self.j_p_of2)
-        self.__add_journal_entry(self.j_p_of4)
-        self.__add_journal_entry(self.j_p_of5)
-        self.__add_journal_entry(self.j_p_of6)
-        self.__set_is_need_offset(True)
-        self.__add_journal_entry(self.j_r_of3)
-        self.__add_journal_entry(self.j_p_of3)
-
-    def __set_is_need_offset(self, is_need_offset: bool) -> None:
-        """Sets whether the payables and receivables need offset.
-
-        :param is_need_offset: True if payables and receivables need offset, or
-            False otherwise.
-        :return:
-        """
-        from accounting.models import Account
-        with self.app.app_context():
-            for code in {Accounts.RECEIVABLE, Accounts.PAYABLE}:
-                account: Account | None = Account.find_by_code(code)
-                assert account is not None
-                account.is_need_offset = is_need_offset
-            db.session.commit()
-
-    def __add_journal_entry(self, journal_entry_data: JournalEntryData) \
-            -> None:
-        """Adds a journal entry.
-
-        :param journal_entry_data: The journal entry data.
-        :return: None.
-        """
-        from accounting.models import JournalEntry
-        store_uri: str = "/accounting/journal-entries/store/transfer"
-
-        response: httpx.Response = self.client.post(
-            store_uri, data=journal_entry_data.new_form(self.csrf_token))
-        assert response.status_code == 302
-        journal_entry_id: int \
-            = match_journal_entry_detail(response.headers["Location"])
-        journal_entry_data.id = journal_entry_id
-        with self.app.app_context():
-            journal_entry: JournalEntry | None \
-                = db.session.get(JournalEntry, journal_entry_id)
-            assert journal_entry is not None
-            for i in range(len(journal_entry.currencies)):
-                for j in range(len(journal_entry.currencies[i].debit)):
-                    journal_entry_data.currencies[i].debit[j].id \
-                        = journal_entry.currencies[i].debit[j].id
-                for j in range(len(journal_entry.currencies[i].credit)):
-                    journal_entry_data.currencies[i].credit[j].id \
-                        = journal_entry.currencies[i].credit[j].id
+        self._set_need_offset({Accounts.RECEIVABLE, Accounts.PAYABLE}, True)
+        self._add_journal_entry(j_r_of3)
+        self._add_journal_entry(j_p_of3)

tests/testlib.py

@@ -17,12 +17,19 @@
 """The common test libraries.
 
 """
+from __future__ import annotations
+
+import re
 import typing as t
+from abc import ABC, abstractmethod
+from datetime import date, timedelta
+
+from _decimal import Decimal
 
 import httpx
 from flask import Flask, render_template_string
 
-from test_site import create_app
+from test_site import create_app, db
 
 TEST_SERVER: str = "https://testserver"
 """The test server URI."""
@@ -117,3 +124,269 @@ def set_locale(client: httpx.Client, csrf_token: str,
                                                  "next": "/next"})
     assert response.status_code == 302
     assert response.headers["Location"] == "/next"
+
+
+def add_journal_entry(client: httpx.Client, form: dict[str, str]) -> int:
+    """Adds a transfer journal entry.
+
+    :param client: The client.
+    :param form: The form data.
+    :return: The newly-added journal entry ID.
+    """
+    prefix: str = "/accounting/journal-entries"
+    journal_entry_type: str = "transfer"
+    if len({x for x in form if "-debit-" in x}) == 0:
+        journal_entry_type = "receipt"
+    elif len({x for x in form if "-credit-" in x}) == 0:
+        journal_entry_type = "disbursement"
+    store_uri = f"{prefix}/store/{journal_entry_type}"
+    response: httpx.Response = client.post(store_uri, data=form)
+    assert response.status_code == 302
+    return match_journal_entry_detail(response.headers["Location"])
+
+
+def match_journal_entry_detail(location: str) -> int:
+    """Validates if the redirect location is the journal entry detail, and
+    returns the journal entry ID on success.
+
+    :param location: The redirect location.
+    :return: The journal entry ID.
+    :raise AssertionError: When the location is not the journal entry detail.
+    """
+    m: re.Match = re.match(
+        r"^/accounting/journal-entries/(\d+)\?next=%2F_next", location)
+    assert m is not None
+    return int(m.group(1))
+
+
+class JournalEntryLineItemData:
+    """The journal entry line item data."""
+
+    def __init__(self, account: str, description: str, amount: str,
+                 original_line_item: JournalEntryLineItemData | None = None):
+        """Constructs the journal entry line item data.
+
+        :param account: The account code.
+        :param description: The description.
+        :param amount: The amount.
+        :param original_line_item: The original journal entry line item.
+        """
+        self.journal_entry: JournalEntryData | None = None
+        self.id: int = -1
+        self.no: int = -1
+        self.original_line_item: JournalEntryLineItemData | None \
+            = original_line_item
+        self.account: str = account
+        self.description: str = description
+        self.amount: Decimal = Decimal(amount)
+
+    def form(self, prefix: str, debit_credit: str, index: int,
+             is_update: bool) -> dict[str, str]:
+        """Returns the line item as form data.
+
+        :param prefix: The prefix of the form fields.
+        :param debit_credit: Either "debit" or "credit".
+        :param index: The line item index.
+        :param is_update: True for an update operation, or False otherwise
+        :return: The form data.
+        """
+        prefix = f"{prefix}-{debit_credit}-{index}"
+        form: dict[str, str] = {f"{prefix}-account_code": self.account,
+                                f"{prefix}-description": self.description,
+                                f"{prefix}-amount": str(self.amount)}
+        if is_update and self.id != -1:
+            form[f"{prefix}-id"] = str(self.id)
+        form[f"{prefix}-no"] = str(index) if self.no == -1 else str(self.no)
+        if self.original_line_item is not None:
+            assert self.original_line_item.id != -1
+            form[f"{prefix}-original_line_item_id"] \
+                = str(self.original_line_item.id)
+        return form
+
+
+class JournalEntryCurrencyData:
+    """The journal entry currency data."""
+
+    def __init__(self, currency: str, debit: list[JournalEntryLineItemData],
+                 credit: list[JournalEntryLineItemData]):
+        """Constructs the journal entry currency data.
+
+        :param currency: The currency code.
+        :param debit: The debit line items.
+        :param credit: The credit line items.
+        """
+        self.code: str = currency
+        self.debit: list[JournalEntryLineItemData] = debit
+        self.credit: list[JournalEntryLineItemData] = credit
+
+    def form(self, index: int, is_update: bool) -> dict[str, str]:
+        """Returns the currency as form data.
+
+        :param index: The currency index.
+        :param is_update: True for an update operation, or False otherwise
+        :return: The form data.
+        """
+        prefix: str = f"currency-{index}"
+        form: dict[str, str] = {f"{prefix}-code": self.code}
+        for i in range(len(self.debit)):
+            form.update(self.debit[i].form(prefix, "debit", i + 1, is_update))
+        for i in range(len(self.credit)):
+            form.update(self.credit[i].form(prefix, "credit", i + 1,
+                                            is_update))
+        return form
+
+
+class JournalEntryData:
+    """The journal entry data."""
+
+    def __init__(self, days: int, currencies: list[JournalEntryCurrencyData]):
+        """Constructs a journal entry.
+
+        :param days: The number of days before today.
+        :param currencies: The journal entry currency data.
+        """
+        self.id: int = -1
+        self.days: int = days
+        self.currencies: list[JournalEntryCurrencyData] = currencies
+        self.note: str | None = None
+        for currency in self.currencies:
+            for line_item in currency.debit:
+                line_item.journal_entry = self
+            for line_item in currency.credit:
+                line_item.journal_entry = self
+
+    def new_form(self, csrf_token: str) -> dict[str, str]:
+        """Returns the journal entry as a creation form.
+
+        :param csrf_token: The CSRF token.
+        :return: The journal entry as a creation form.
+        """
+        return self.__form(csrf_token, is_update=False)
+
+    def update_form(self, csrf_token: str) -> dict[str, str]:
+        """Returns the journal entry as an update form.
+
+        :param csrf_token: The CSRF token.
+        :return: The journal entry as an update form.
+        """
+        return self.__form(csrf_token, is_update=True)
+
+    def __form(self, csrf_token: str, is_update: bool = False) \
+            -> dict[str, str]:
+        """Returns the journal entry as a form.
+
+        :param csrf_token: The CSRF token.
+        :param is_update: True for an update operation, or False otherwise
+        :return: The journal entry as a form.
+        """
+        journal_entry_date: date = date.today() - timedelta(days=self.days)
+        form: dict[str, str] = {"csrf_token": csrf_token,
+                                "next": NEXT_URI,
+                                "date": journal_entry_date.isoformat()}
+        for i in range(len(self.currencies)):
+            form.update(self.currencies[i].form(i + 1, is_update))
+        if self.note is not None:
+            form["note"] = self.note
+        return form
+
+
+class BaseTestData(ABC):
+    """The base test data."""
+
+    def __init__(self, app: Flask, client: httpx.Client, csrf_token: str):
+        """Constructs the test data.
+
+        :param app: The Flask application.
+        :param client: The client.
+        :param csrf_token: The CSRF token.
+        """
+        self.app: Flask = app
+        self.client: httpx.Client = client
+        self.csrf_token: str = csrf_token
+        self._init_data()
+
+    @abstractmethod
+    def _init_data(self) -> None:
+        """Initializes the test data.
+
+        :return: None
+        """
+
+    @staticmethod
+    def _couple(description: str, amount: str, debit: str, credit: str) \
+            -> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
+        """Returns a couple of debit-credit line items.
+
+        :param description: The description.
+        :param amount: The amount.
+        :param debit: The debit account code.
+        :param credit: The credit account code.
+        :return: The debit line item and credit line item.
+        """
+        return JournalEntryLineItemData(debit, description, amount),\
+            JournalEntryLineItemData(credit, description, amount)
+
+    def _add_journal_entry(self, journal_entry_data: JournalEntryData) -> None:
+        """Adds a journal entry.
+
+        :param journal_entry_data: The journal entry data.
+        :return: None.
+        """
+        from accounting.models import JournalEntry
+        store_uri: str = "/accounting/journal-entries/store/transfer"
+
+        response: httpx.Response = self.client.post(
+            store_uri, data=journal_entry_data.new_form(self.csrf_token))
+        assert response.status_code == 302
+        journal_entry_id: int \
+            = match_journal_entry_detail(response.headers["Location"])
+        journal_entry_data.id = journal_entry_id
+        with self.app.app_context():
+            journal_entry: JournalEntry | None \
+                = db.session.get(JournalEntry, journal_entry_id)
+            assert journal_entry is not None
+            for i in range(len(journal_entry.currencies)):
+                for j in range(len(journal_entry.currencies[i].debit)):
+                    journal_entry_data.currencies[i].debit[j].id \
+                        = journal_entry.currencies[i].debit[j].id
+                for j in range(len(journal_entry.currencies[i].credit)):
+                    journal_entry_data.currencies[i].credit[j].id \
+                        = journal_entry.currencies[i].credit[j].id
+
+    def _add_simple_journal_entry(
+            self, days: int, currency: str, description: str, amount: str,
+            debit: str, credit: str) \
+            -> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
+        """Adds a simple journal entry.
+
+        :param days: The number of days before today.
+        :param currency: The currency code.
+        :param description: The description.
+        :param amount: The amount.
+        :param debit: The debit account code.
+        :param credit: The credit account code.
+        :return: The debit line item and credit line item.
+        """
+        debit_item, credit_item = self._couple(
+            description, amount, debit, credit)
+        self._add_journal_entry(JournalEntryData(
+            days, [JournalEntryCurrencyData(
+                currency, [debit_item], [credit_item])]))
+        return debit_item, credit_item
+
+    def _set_need_offset(self, account_codes: set[str],
+                         is_need_offset: bool) -> None:
+        """Sets whether the line items in some accounts need offset.
+
+        :param account_codes: The account codes.
+        :param is_need_offset: True if the line items in the accounts need
+            offset, or False otherwise.
+        :return:
+        """
+        from accounting.models import Account
+        with self.app.app_context():
+            for code in account_codes:
+                account: Account | None = Account.find_by_code(code)
+                assert account is not None
+                account.is_need_offset = is_need_offset
+            db.session.commit()

tests/testlib_journal_entry.py

@@ -18,11 +18,10 @@
 
 """
 import re
-from decimal import Decimal
 from datetime import date
+from decimal import Decimal
 from secrets import randbelow
 
-import httpx
 from flask import Flask
 
 from test_site import db
@@ -375,39 +374,6 @@ def __get_currency_prefix(form: dict[str, str], code: str) -> str:
     return m.group(1)
 
 
-def add_journal_entry(client: httpx.Client, form: dict[str, str]) -> int:
-    """Adds a transfer journal entry.
-
-    :param client: The client.
-    :param form: The form data.
-    :return: The newly-added journal entry ID.
-    """
-    prefix: str = "/accounting/journal-entries"
-    journal_entry_type: str = "transfer"
-    if len({x for x in form if "-debit-" in x}) == 0:
-        journal_entry_type = "receipt"
-    elif len({x for x in form if "-credit-" in x}) == 0:
-        journal_entry_type = "disbursement"
-    store_uri = f"{prefix}/store/{journal_entry_type}"
-    response: httpx.Response = client.post(store_uri, data=form)
-    assert response.status_code == 302
-    return match_journal_entry_detail(response.headers["Location"])
-
-
-def match_journal_entry_detail(location: str) -> int:
-    """Validates if the redirect location is the journal entry detail, and
-    returns the journal entry ID on success.
-
-    :param location: The redirect location.
-    :return: The journal entry ID.
-    :raise AssertionError: When the location is not the journal entry detail.
-    """
-    m: re.Match = re.match(
-        r"^/accounting/journal-entries/(\d+)\?next=%2F_next", location)
-    assert m is not None
-    return int(m.group(1))
-
-
 def set_negative_amount(form: dict[str, str]) -> None:
     """Sets a negative amount in the form data, keeping the balance.
 

tests/testlib_offset.py

@@ -1,315 +0,0 @@
-# The Mia! Accounting Project.
-# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/27
-
-#  Copyright (c) 2023 imacat.
-#
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
-"""The common test libraries for the offset test cases.
-
-"""
-from __future__ import annotations
-
-from datetime import date, timedelta
-from decimal import Decimal
-
-import httpx
-from flask import Flask
-
-from test_site import db
-from testlib import NEXT_URI, Accounts
-from testlib_journal_entry import match_journal_entry_detail
-
-
-class JournalEntryLineItemData:
-    """The journal entry line item data."""
-
-    def __init__(self, account: str, description: str, amount: str,
-                 original_line_item: JournalEntryLineItemData | None = None):
-        """Constructs the journal entry line item data.
-
-        :param account: The account code.
-        :param description: The description.
-        :param amount: The amount.
-        :param original_line_item: The original journal entry line item.
-        """
-        self.journal_entry: JournalEntryData | None = None
-        self.id: int = -1
-        self.no: int = -1
-        self.original_line_item: JournalEntryLineItemData | None \
-            = original_line_item
-        self.account: str = account
-        self.description: str = description
-        self.amount: Decimal = Decimal(amount)
-
-    def form(self, prefix: str, debit_credit: str, index: int,
-             is_update: bool) -> dict[str, str]:
-        """Returns the line item as form data.
-
-        :param prefix: The prefix of the form fields.
-        :param debit_credit: Either "debit" or "credit".
-        :param index: The line item index.
-        :param is_update: True for an update operation, or False otherwise
-        :return: The form data.
-        """
-        prefix = f"{prefix}-{debit_credit}-{index}"
-        form: dict[str, str] = {f"{prefix}-account_code": self.account,
-                                f"{prefix}-description": self.description,
-                                f"{prefix}-amount": str(self.amount)}
-        if is_update and self.id != -1:
-            form[f"{prefix}-id"] = str(self.id)
-        form[f"{prefix}-no"] = str(index) if self.no == -1 else str(self.no)
-        if self.original_line_item is not None:
-            assert self.original_line_item.id != -1
-            form[f"{prefix}-original_line_item_id"] \
-                = str(self.original_line_item.id)
-        return form
-
-
-class CurrencyData:
-    """The journal entry currency data."""
-
-    def __init__(self, currency: str, debit: list[JournalEntryLineItemData],
-                 credit: list[JournalEntryLineItemData]):
-        """Constructs the journal entry currency data.
-
-        :param currency: The currency code.
-        :param debit: The debit line items.
-        :param credit: The credit line items.
-        """
-        self.code: str = currency
-        self.debit: list[JournalEntryLineItemData] = debit
-        self.credit: list[JournalEntryLineItemData] = credit
-
-    def form(self, index: int, is_update: bool) -> dict[str, str]:
-        """Returns the currency as form data.
-
-        :param index: The currency index.
-        :param is_update: True for an update operation, or False otherwise
-        :return: The form data.
-        """
-        prefix: str = f"currency-{index}"
-        form: dict[str, str] = {f"{prefix}-code": self.code}
-        for i in range(len(self.debit)):
-            form.update(self.debit[i].form(prefix, "debit", i + 1, is_update))
-        for i in range(len(self.credit)):
-            form.update(self.credit[i].form(prefix, "credit", i + 1,
-                                            is_update))
-        return form
-
-
-class JournalEntryData:
-    """The journal entry data."""
-
-    def __init__(self, days: int, currencies: list[CurrencyData]):
-        """Constructs a journal entry.
-
-        :param days: The number of days before today.
-        :param currencies: The journal entry currency data.
-        """
-        self.id: int = -1
-        self.days: int = days
-        self.currencies: list[CurrencyData] = currencies
-        self.note: str | None = None
-        for currency in self.currencies:
-            for line_item in currency.debit:
-                line_item.journal_entry = self
-            for line_item in currency.credit:
-                line_item.journal_entry = self
-
-    def new_form(self, csrf_token: str) -> dict[str, str]:
-        """Returns the journal entry as a creation form.
-
-        :param csrf_token: The CSRF token.
-        :return: The journal entry as a creation form.
-        """
-        return self.__form(csrf_token, is_update=False)
-
-    def update_form(self, csrf_token: str) -> dict[str, str]:
-        """Returns the journal entry as an update form.
-
-        :param csrf_token: The CSRF token.
-        :return: The journal entry as an update form.
-        """
-        return self.__form(csrf_token, is_update=True)
-
-    def __form(self, csrf_token: str, is_update: bool = False) \
-            -> dict[str, str]:
-        """Returns the journal entry as a form.
-
-        :param csrf_token: The CSRF token.
-        :param is_update: True for an update operation, or False otherwise
-        :return: The journal entry as a form.
-        """
-        journal_entry_date: date = date.today() - timedelta(days=self.days)
-        form: dict[str, str] = {"csrf_token": csrf_token,
-                                "next": NEXT_URI,
-                                "date": journal_entry_date.isoformat()}
-        for i in range(len(self.currencies)):
-            form.update(self.currencies[i].form(i + 1, is_update))
-        if self.note is not None:
-            form["note"] = self.note
-        return form
-
-
-class TestData:
-    """The test data."""
-
-    def __init__(self, app: Flask, client: httpx.Client, csrf_token: str):
-        """Constructs the test data.
-
-        :param app: The Flask application.
-        :param client: The client.
-        :param csrf_token: The CSRF token.
-        """
-        self.app: Flask = app
-        self.client: httpx.Client = client
-        self.csrf_token: str = csrf_token
-
-        def couple(description: str, amount: str, debit: str, credit: str) \
-                -> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
-            """Returns a couple of debit-credit line items.
-
-            :param description: The description.
-            :param amount: The amount.
-            :param debit: The debit account code.
-            :param credit: The credit account code.
-            :return: The debit line item and credit line item.
-            """
-            return JournalEntryLineItemData(debit, description, amount),\
-                JournalEntryLineItemData(credit, description, amount)
-
-        # Receivable original line items
-        self.l_r_or1d, self.l_r_or1c = couple(
-            "Accountant", "1200", Accounts.RECEIVABLE, Accounts.SERVICE)
-        self.l_r_or2d, self.l_r_or2c = couple(
-            "Toy", "600", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or3d, self.l_r_or3c = couple(
-            "Noodles", "100", Accounts.RECEIVABLE, Accounts.SALES)
-        self.l_r_or4d, self.l_r_or4c = couple(
-            "Interest", "3.4", Accounts.RECEIVABLE, Accounts.INTEREST)
-
-        # Payable original line items
-        self.l_p_or1d, self.l_p_or1c = couple(
-            "Airplane", "2000", Accounts.TRAVEL, Accounts.PAYABLE)
-        self.l_p_or2d, self.l_p_or2c = couple(
-            "Phone", "900", Accounts.OFFICE, Accounts.PAYABLE)
-        self.l_p_or3d, self.l_p_or3c = couple(
-            "Steak", "120", Accounts.MEAL, Accounts.PAYABLE)
-        self.l_p_or4d, self.l_p_or4c = couple(
-            "Envelop", "0.9", Accounts.OFFICE, Accounts.PAYABLE)
-
-        # Original journal entries
-        self.j_r_or1: JournalEntryData = JournalEntryData(
-            50, [CurrencyData("USD", [self.l_r_or1d, self.l_r_or4d],
-                              [self.l_r_or1c, self.l_r_or4c])])
-        self.j_r_or2: JournalEntryData = JournalEntryData(
-            30, [CurrencyData("USD", [self.l_r_or2d, self.l_r_or3d],
-                              [self.l_r_or2c, self.l_r_or3c])])
-        self.j_p_or1: JournalEntryData = JournalEntryData(
-            40, [CurrencyData("USD", [self.l_p_or1d, self.l_p_or4d],
-                              [self.l_p_or1c, self.l_p_or4c])])
-        self.j_p_or2: JournalEntryData = JournalEntryData(
-            20, [CurrencyData("USD", [self.l_p_or2d, self.l_p_or3d],
-                              [self.l_p_or2c, self.l_p_or3c])])
-
-        self.__add_journal_entry(self.j_r_or1)
-        self.__add_journal_entry(self.j_r_or2)
-        self.__add_journal_entry(self.j_p_or1)
-        self.__add_journal_entry(self.j_p_or2)
-
-        # Receivable offset items
-        self.l_r_of1d, self.l_r_of1c = couple(
-            "Accountant", "500", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of1c.original_line_item = self.l_r_or1d
-        self.l_r_of2d, self.l_r_of2c = couple(
-            "Accountant", "200", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of2c.original_line_item = self.l_r_or1d
-        self.l_r_of3d, self.l_r_of3c = couple(
-            "Accountant", "100", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of3c.original_line_item = self.l_r_or1d
-        self.l_r_of4d, self.l_r_of4c = couple(
-            "Toy", "240", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of4c.original_line_item = self.l_r_or2d
-        self.l_r_of5d, self.l_r_of5c = couple(
-            "Interest", "3.4", Accounts.CASH, Accounts.RECEIVABLE)
-        self.l_r_of5c.original_line_item = self.l_r_or4d
-
-        # Payable offset items
-        self.l_p_of1d, self.l_p_of1c = couple(
-            "Airplane", "800", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of1d.original_line_item = self.l_p_or1c
-        self.l_p_of2d, self.l_p_of2c = couple(
-            "Airplane", "300", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of2d.original_line_item = self.l_p_or1c
-        self.l_p_of3d, self.l_p_of3c = couple(
-            "Airplane", "100", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of3d.original_line_item = self.l_p_or1c
-        self.l_p_of4d, self.l_p_of4c = couple(
-            "Phone", "400", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of4d.original_line_item = self.l_p_or2c
-        self.l_p_of5d, self.l_p_of5c = couple(
-            "Envelop", "0.9", Accounts.PAYABLE, Accounts.CASH)
-        self.l_p_of5d.original_line_item = self.l_p_or4c
-
-        # Offset journal entries
-        self.j_r_of1: JournalEntryData = JournalEntryData(
-            25, [CurrencyData("USD", [self.l_r_of1d], [self.l_r_of1c])])
-        self.j_r_of2: JournalEntryData = JournalEntryData(
-            20, [CurrencyData("USD",
-                              [self.l_r_of2d, self.l_r_of3d, self.l_r_of4d],
-                              [self.l_r_of2c, self.l_r_of3c, self.l_r_of4c])])
-        self.j_r_of3: JournalEntryData = JournalEntryData(
-            15, [CurrencyData("USD", [self.l_r_of5d], [self.l_r_of5c])])
-        self.j_p_of1: JournalEntryData = JournalEntryData(
-            15, [CurrencyData("USD", [self.l_p_of1d], [self.l_p_of1c])])
-        self.j_p_of2: JournalEntryData = JournalEntryData(
-            10, [CurrencyData("USD",
-                              [self.l_p_of2d, self.l_p_of3d, self.l_p_of4d],
-                              [self.l_p_of2c, self.l_p_of3c, self.l_p_of4c])])
-        self.j_p_of3: JournalEntryData = JournalEntryData(
-            5, [CurrencyData("USD", [self.l_p_of5d], [self.l_p_of5c])])
-
-        self.__add_journal_entry(self.j_r_of1)
-        self.__add_journal_entry(self.j_r_of2)
-        self.__add_journal_entry(self.j_r_of3)
-        self.__add_journal_entry(self.j_p_of1)
-        self.__add_journal_entry(self.j_p_of2)
-        self.__add_journal_entry(self.j_p_of3)
-
-    def __add_journal_entry(self, journal_entry_data: JournalEntryData) \
-            -> None:
-        """Adds a journal entry.
-
-        :param journal_entry_data: The journal entry data.
-        :return: None.
-        """
-        from accounting.models import JournalEntry
-        store_uri: str = "/accounting/journal-entries/store/transfer"
-
-        response: httpx.Response = self.client.post(
-            store_uri, data=journal_entry_data.new_form(self.csrf_token))
-        assert response.status_code == 302
-        journal_entry_id: int \
-            = match_journal_entry_detail(response.headers["Location"])
-        journal_entry_data.id = journal_entry_id
-        with self.app.app_context():
-            journal_entry: JournalEntry | None \
-                = db.session.get(JournalEntry, journal_entry_id)
-            assert journal_entry is not None
-            for i in range(len(journal_entry.currencies)):
-                for j in range(len(journal_entry.currencies[i].debit)):
-                    journal_entry_data.currencies[i].debit[j].id \
-                        = journal_entry.currencies[i].debit[j].id
-                for j in range(len(journal_entry.currencies[i].credit)):
-                    journal_entry_data.currencies[i].credit[j].id \
-                        = journal_entry.currencies[i].credit[j].id