[fix] Add tests for user credentials data migration

Author: Eeshu-Yadav

openwisp_radius/tests/test_migrations.py

@@ -0,0 +1,54 @@
+import importlib
+import json
+
+from unittest.mock import MagicMock
+
+from django.db import connection
+from django.test import TestCase
+
+from openwisp_radius.models import RadiusBatch
+
+migration_module = importlib.import_module(
+    "openwisp_radius.migrations.0044_convert_user_credentials_data"
+)
+convert_user_credentials_data = migration_module.convert_user_credentials_data
+
+
+class Test0044Migration(TestCase):
+    def test_convert_user_credentials_data(self):
+        batch = RadiusBatch.objects.create(
+            name="test_batch_migration", strategy="prefix", prefix="test"
+        )
+        RadiusBatch.objects.filter(pk=batch.pk).update(
+            user_credentials=json.dumps({"user1": "pass1"})
+        )
+
+        apps = MagicMock()
+        apps.get_model.return_value = RadiusBatch
+
+        schema_editor = MagicMock()
+        schema_editor.connection = connection
+
+        convert_user_credentials_data(apps, schema_editor)
+
+        batch.refresh_from_db()
+        self.assertEqual(batch.user_credentials, {"user1": "pass1"})
+
+    def test_convert_user_credentials_data_invalid_json(self):
+        batch = RadiusBatch.objects.create(
+            name="test_batch_invalid", strategy="prefix", prefix="test2"
+        )
+        RadiusBatch.objects.filter(pk=batch.pk).update(
+            user_credentials="invalid_json_string"
+        )
+
+        apps = MagicMock()
+        apps.get_model.return_value = RadiusBatch
+
+        schema_editor = MagicMock()
+        schema_editor.connection = connection
+
+        convert_user_credentials_data(apps, schema_editor)
+
+        batch.refresh_from_db()
+        self.assertEqual(batch.user_credentials, "invalid_json_string")