diff --git a/server/src/test/transient_data/test_transient_data.py b/server/src/test/transient_data/test_transient_data.py
new file mode 100644
index 0000000..10a4e94
--- /dev/null
+++ b/server/src/test/transient_data/test_transient_data.py
@@ -0,0 +1,88 @@
+import unittest
+from unittest.mock import patch, MagicMock
+from src.functions.transient_data.transient_data import fetch_trains, fetch_luas, fetch_buses, batch_upload_to_dynamodb, lambda_handler
+
+class TestTransientData(unittest.TestCase):
+
+    @patch('src.functions.transient_data.transient_data.session.get')
+    def test_fetch_trains_returns_data(self, mock_get):
+        mock_response = MagicMock()
+        mock_response.text = '<ArrayOfObjTrainPositions><objTrainPositions><TrainCode>123</TrainCode><TrainLatitude>53.349805</TrainLatitude><TrainLongitude>-6.26031</TrainLongitude><TrainStatus>Running</TrainStatus><TrainDate>2023-10-10</TrainDate><PublicMessage>On time</PublicMessage><Direction>North</Direction></objTrainPositions></ArrayOfObjTrainPositions>'
+        mock_get.return_value = mock_response
+
+        with patch('src.functions.transient_data.transient_data.xmltodict.parse', return_value={
+            "ArrayOfObjTrainPositions": {
+                "objTrainPositions": [{
+                    "TrainCode": "123",
+                    "TrainLatitude": "53.349805",
+                    "TrainLongitude": "-6.26031",
+                    "TrainStatus": "Running",
+                    "TrainDate": "2023-10-10",
+                    "PublicMessage": "On time",
+                    "Direction": "North"
+                }]
+            }
+        }):
+            result = fetch_trains()
+            self.assertEqual(len(result), 3)  # Expecting 3 items for 3 train types
+            self.assertEqual(result[0]['trainCode'], '123')
+
+    @patch('src.functions.transient_data.transient_data.session.get')
+    def test_fetch_luas_returns_data(self, mock_get):
+        # Mock the response for the Luas stops data
+        mock_stops_response = MagicMock()
+        mock_stops_response.content.decode.return_value = 'Abbreviation\tLatitude\tLongitude\tName\tIrishName\tStopID\tLineID\tSortOrder\tIsEnabled\tIsParkAndRide\tIsCycleAndRide\tZoneCountA\tZoneCountB\nSTP1\t53.349805\t-6.26031\tStop1\tStop1Irish\t1\t1\t1\t1\t0\t0\t1\t1'
+        mock_forecast_response = MagicMock()
+        mock_forecast_response.text = '<stopInfo><message>On time</message><direction>North</direction></stopInfo>'
+        mock_get.side_effect = [mock_stops_response, mock_forecast_response]
+
+        result = fetch_luas()
+        self.assertGreater(len(result), 0)
+        self.assertIn('luasStopName', result[0])
+
+    @patch('src.functions.transient_data.transient_data.session.get')
+    @patch.dict('os.environ', {'PERMANENT_DATA_API': 'http://mocked_api'})
+    def test_fetch_buses_returns_data(self, mock_get):
+        mock_response = MagicMock()
+        mock_response.json.return_value = {
+            "entity": [
+                {
+                    "id": "1",
+                    "vehicle": {
+                        "position": {"latitude": 53.349805, "longitude": -6.26031},
+                        "trip": {"route_id": "123", "trip_id": "456", "start_time": "10:00",
+                                 "start_date": "2023-10-10", "schedule_relationship": "Scheduled",
+                                 "direction_id": 0}
+                    }
+                }
+            ]
+        }
+        mock_get.return_value = mock_response
+
+        result = fetch_buses()
+        self.assertEqual(len(result), 1)
+        self.assertEqual(result[0]['busID'], '1')
+
+    @patch('src.functions.transient_data.transient_data.table.batch_writer')
+    def test_batch_upload_to_dynamodb_uploads_data(self, mock_batch_writer):
+        mock_batch = MagicMock()
+        mock_batch_writer.return_value.__enter__.return_value = mock_batch
+
+        data = [{'objectID': '1', 'objectType': 'Test'}]
+        batch_upload_to_dynamodb(data)
+        mock_batch.put_item.assert_called_once_with(Item=data[0])
+
+    @patch('src.functions.transient_data.transient_data.fetch_trains')
+    @patch('src.functions.transient_data.transient_data.fetch_luas')
+    @patch('src.functions.transient_data.transient_data.fetch_buses')
+    @patch('src.functions.transient_data.transient_data.batch_upload_to_dynamodb')
+    def test_lambda_handler_executes_successfully(self, mock_batch_upload, mock_fetch_buses, mock_fetch_luas, mock_fetch_trains):
+        mock_fetch_trains.return_value = [{'objectID': '1', 'objectType': 'Train'}]
+        mock_fetch_luas.return_value = [{'objectID': '2', 'objectType': 'Luas'}]
+        mock_fetch_buses.return_value = [{'objectID': '3', 'objectType': 'Bus'}]
+
+        event = {}
+        context = {}
+        result = lambda_handler(event, context)
+        self.assertEqual(result['statusCode'], 200)
+        self.assertIn('Data uploaded successfully', result['body'])