diff --git a/tests/test_offset.py b/tests/test_offset.py
index a230dec..37d2ed7 100644
--- a/tests/test_offset.py
+++ b/tests/test_offset.py
@@ -52,6 +52,7 @@ class OffsetTestCase(unittest.TestCase):
 
         self.client, self.csrf_token = get_client(self.app, "editor")
         self.data: OffsetTestData = OffsetTestData(self.app, "editor")
+        self.data.populate()
 
     def test_add_receivable_offset(self) -> None:
         """Tests to add the receivable offset.
diff --git a/tests/test_report.py b/tests/test_report.py
index d277a1b..fa20b51 100644
--- a/tests/test_report.py
+++ b/tests/test_report.py
@@ -55,7 +55,7 @@ class ReportTestCase(unittest.TestCase):
         :return: None.
         """
         client, csrf_token = get_client(self.app, "nobody")
-        ReportTestData(self.app, "editor")
+        ReportTestData(self.app, "editor").populate()
         response: httpx.Response
 
         response = client.get(PREFIX)
@@ -130,7 +130,7 @@ class ReportTestCase(unittest.TestCase):
         :return: None.
         """
         client, csrf_token = get_client(self.app, "viewer")
-        ReportTestData(self.app, "editor")
+        ReportTestData(self.app, "editor").populate()
         response: httpx.Response
 
         response = client.get(PREFIX)
@@ -215,7 +215,7 @@ class ReportTestCase(unittest.TestCase):
 
         :return: None.
         """
-        ReportTestData(self.app, "editor")
+        ReportTestData(self.app, "editor").populate()
         response: httpx.Response
 
         response = self.client.get(PREFIX)
diff --git a/tests/test_unmatched_offset.py b/tests/test_unmatched_offset.py
index 9d12926..423300d 100644
--- a/tests/test_unmatched_offset.py
+++ b/tests/test_unmatched_offset.py
@@ -54,7 +54,7 @@ class UnmatchedOffsetTestCase(unittest.TestCase):
         :return: None.
         """
         client, csrf_token = get_client(self.app, "nobody")
-        DifferentTestData(self.app, "nobody")
+        DifferentTestData(self.app, "nobody").populate()
         response: httpx.Response
 
         response = client.get(PREFIX)
@@ -73,7 +73,7 @@ class UnmatchedOffsetTestCase(unittest.TestCase):
         :return: None.
         """
         client, csrf_token = get_client(self.app, "viewer")
-        DifferentTestData(self.app, "viewer")
+        DifferentTestData(self.app, "viewer").populate()
         response: httpx.Response
 
         response = client.get(PREFIX)
@@ -91,7 +91,7 @@ class UnmatchedOffsetTestCase(unittest.TestCase):
 
         :return: None.
         """
-        DifferentTestData(self.app, "editor")
+        DifferentTestData(self.app, "editor").populate()
         response: httpx.Response
 
         response = self.client.get(PREFIX)
@@ -133,6 +133,7 @@ class UnmatchedOffsetTestCase(unittest.TestCase):
         from accounting.models import Account, JournalEntryLineItem
         from accounting.utils.offset_matcher import OffsetMatcher
         data: DifferentTestData = DifferentTestData(self.app, "editor")
+        data.populate()
         account: Account | None
         line_item: JournalEntryLineItem | None
         matcher: OffsetMatcher
@@ -248,6 +249,7 @@ class UnmatchedOffsetTestCase(unittest.TestCase):
         from accounting.models import Account, JournalEntryLineItem
         from accounting.utils.offset_matcher import OffsetMatcher
         data: SameTestData = SameTestData(self.app, "editor")
+        data.populate()
         account: Account | None
         line_item: JournalEntryLineItem | None
         matcher: OffsetMatcher
diff --git a/tests/testlib.py b/tests/testlib.py
index daf6b8b..5d45c97 100644
--- a/tests/testlib.py
+++ b/tests/testlib.py
@@ -303,8 +303,8 @@ class BaseTestData(ABC):
         :param app: The Flask application.
         :param username: The username.
         """
-        from accounting.models import JournalEntry, JournalEntryLineItem
-        with app.app_context():
+        self.__app: Flask = app
+        with self.__app.app_context():
             current_user: User | None = User.query\
                 .filter(User.username == username).first()
             assert current_user is not None
@@ -312,10 +312,6 @@ class BaseTestData(ABC):
             self.__journal_entries: list[dict[str, t.Any]] = []
             self.__line_items: list[dict[str, t.Any]] = []
             self._init_data()
-            db.session.execute(sa.insert(JournalEntry), self.__journal_entries)
-            db.session.execute(sa.insert(JournalEntryLineItem),
-                               self.__line_items)
-            db.session.commit()
 
     @abstractmethod
     def _init_data(self) -> None:
@@ -324,6 +320,18 @@ class BaseTestData(ABC):
         :return: None
         """
 
+    def populate(self) -> None:
+        """Populates the data into the database.
+
+        :return: None
+        """
+        from accounting.models import JournalEntry, JournalEntryLineItem
+        with self.__app.app_context():
+            db.session.execute(sa.insert(JournalEntry), self.__journal_entries)
+            db.session.execute(sa.insert(JournalEntryLineItem),
+                               self.__line_items)
+            db.session.commit()
+
     @staticmethod
     def _couple(description: str, amount: str, debit: str, credit: str) \
             -> tuple[JournalEntryLineItemData, JournalEntryLineItemData]: