diff --git a/accounting/tests.py b/accounting/tests.py
index 7ce503c..2ad7a07 100644
--- a/accounting/tests.py
+++ b/accounting/tests.py
@@ -1,3 +1,75 @@
+# The accounting application of the Mia project.
+#   by imacat <imacat@mail.imacat.idv.tw>, 2020/8/2
+
+#  Copyright (c) 2020 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 cases of the accounting application.
+
+"""
 from django.test import TestCase
 
-# Create your tests here.
+from .utils import sort_post_txn_records
+
+
+class SortTransactionPostTestCase(TestCase):
+    """Tests the sort_post_txn_records() utility."""
+
+    def test_sort(self):
+        """Tests the sort_post_txn_records() utility."""
+        post = {
+            "date": "2020-07-15",
+            "notes": "",
+            "debit-2-account": "4144",
+            "debit-2-ord": "4",
+            "debit-2-summary": "",
+            "debit-2-amount": "262",
+            "debit-3-id": "714703431",
+            "debit-3-account": "2715",
+            "debit-3-ord": "4",
+            "debit-3-summary": "lunch",
+            "debit-3-amount": "477",
+            "debit-16-id": "541574719",
+            "debit-16-account": "6634",
+            "debit-16-ord": "2",
+            "debit-16-summary": "dinner",
+            "debit-16-amount": "525",
+            "credit-7-id": "747725334",
+            "credit-7-account": "1211",
+            "credit-7-ord": "3",
+            "credit-7-summary": "",
+            "credit-7-amount": "667",
+        }
+        sort_post_txn_records(post)
+        self.assertEqual(post.get("date"), "2020-07-15")
+        self.assertEqual(post.get("notes"), "")
+        self.assertEqual(post.get("debit-1-ord"), "1")
+        self.assertEqual(post.get("debit-1-id"), "541574719")
+        self.assertEqual(post.get("debit-1-account"), "6634")
+        self.assertEqual(post.get("debit-1-summary"), "dinner")
+        self.assertEqual(post.get("debit-1-amount"), "525")
+        self.assertEqual(post.get("debit-2-ord"), "2")
+        self.assertEqual(post.get("debit-2-account"), "4144")
+        self.assertEqual(post.get("debit-2-summary"), "")
+        self.assertEqual(post.get("debit-2-amount"), "262")
+        self.assertEqual(post.get("debit-3-ord"), "3")
+        self.assertEqual(post.get("debit-3-id"), "714703431")
+        self.assertEqual(post.get("debit-3-account"), "2715")
+        self.assertEqual(post.get("debit-3-summary"), "lunch")
+        self.assertEqual(post.get("debit-3-amount"), "477")
+        self.assertEqual(post.get("credit-1-ord"), "1")
+        self.assertEqual(post.get("credit-1-id"), "747725334")
+        self.assertEqual(post.get("credit-1-account"), "1211")
+        self.assertEqual(post.get("credit-1-summary"), "")
+        self.assertEqual(post.get("credit-1-amount"), "667")