diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index f3d4fca..e7419f3 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -26,7 +26,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest
+        pip install flake8
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
@@ -34,6 +34,6 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest
+    - name: Test with unittests
       run: |
-        pytest
+        python -m unittest test_reconciler.py
diff --git a/reconciler_test.py b/reconciler_test.py
deleted file mode 100644
index 8a2b5aa..0000000
--- a/reconciler_test.py
+++ /dev/null
@@ -1,38 +0,0 @@
-import unittest
-from unittest.mock import patch
-import csv
-from reconciler import Reconciler
-
-class TestReconciler(unittest.TestCase):
-    def setUp(self):
-        self.source_data = [
-            {'ID': '1', 'Name': 'John', 'Age': '20'},
-            {'ID': '2', 'Name': 'Jane', 'Age': '21'},
-            {'ID': '3', 'Name': 'Jill', 'Age': '22'},
-            {'ID': '4', 'Name': 'Jack', 'Age': '23'},
-        ]
-        self.target_data = [
-            {'ID': '1', 'Name': 'John', 'Age': '20'},
-            {'ID': '2', 'Name': 'Jane', 'Age': '21'},
-            {'ID': '3', 'Name': 'Jill', 'Age': '22'},
-            {'ID': '4', 'Name': 'Jack', 'Age': '23'},
-            {'ID': '5', 'Name': 'Jake', 'Age': '24'},
-        ]
-
-    @patch('reconcile.Reconcile._read_csv')
-    def test_check_missing_records(self, mock_read_csv):
-        mock_read_csv.side_effect = [self.source_data, self.target_data]
-        reconcile = Reconciler('source.csv', 'target.csv')
-        missing_in_target, missing_in_source = reconcile.reconcile_data()
-        self.assertEqual(missing_in_target, {'5'})
-        self.assertEqual(missing_in_source, {'5'})
-
-    @patch('reconciler.Reconciler._read_csv')
-    def test_report_generation(self, mock_read_csv):
-        mock_read_csv.return_value = []
-        reconciler = Reconciler('source.csv', 'target.csv')
-        report = reconciler.reconcile_data()
-
-        with patch('reconciler.ReconciliationReport.generate_report') as mock_generate_report:
-            reconciler.reconcile_data().generate_report('output.csv')
-            mock_generate_report.assert_called_once_with('output.csv')
diff --git a/test_output.csv b/test_output.csv
new file mode 100644
index 0000000..a915fc9
--- /dev/null
+++ b/test_output.csv
@@ -0,0 +1,3 @@
+Type,Record Identifier,Field,Source Value,Target Value
+Missing in Target,1,,,
+Missing in Source,3,,,
diff --git a/test_reconciler.py b/test_reconciler.py
new file mode 100644
index 0000000..503ff1a
--- /dev/null
+++ b/test_reconciler.py
@@ -0,0 +1,46 @@
+import unittest
+import csv
+import os
+from reconciler import Reconciler, ReconciliationReport
+
+class TestReconciler(unittest.TestCase):
+    def setUp(self):
+        # Create sample CSV files for testing
+        self.source_csv_path =  'test_source.csv'
+        self.target_csv_path = 'test_target.csv'
+        self.output_csv_path = 'test_output.csv'
+
+        self.create_sample_csv(self.source_csv_path, [{'ID': '1', 'Name': 'John'}, {'ID': '2', 'Name': 'Alice'}])
+        self.create_sample_csv(self.target_csv_path, [{'ID': '2', 'Name': 'Alice'}, {'ID': '3', 'Name': 'Bob'}])
+
+    def tearDown(self):
+        # Remove sample CSV files after testing
+        os.remove(self.source_csv_path)
+        os.remove(self.target_csv_path)
+
+
+    def create_sample_csv(self, file_path, data):
+        with open(file_path, 'w', newline='') as file:
+            writer = csv.DictWriter(file, fieldnames=['ID', 'Name'])
+            writer.writeheader()
+            writer.writerows(data)
+
+    def test_reconciliation_with_discrepancies(self):
+        rc = Reconciler(self.source_csv_path, self.target_csv_path)
+        report = rc.reconcile_data()
+
+        self.assertIsInstance(report, ReconciliationReport)
+        self.assertTrue(report.missing_in_target)
+        self.assertTrue(report.missing_in_source)
+        self.assertTrue(report.discrepancies)
+
+
+    def test_report_generation(self):
+        rc = Reconciler(self.source_csv_path, self.target_csv_path)
+        report = rc.reconcile_data()
+        report.generate_report(self.output_csv_path)
+
+        self.assertTrue(os.path.exists(self.output_csv_path))
+
+if __name__ == '__main__':
+    unittest.main()