Refactor object tracking func setup and fix unit tests for tracker

src/live_stream_tracker.py

@@ -101,7 +101,7 @@ def run_detection(self):
         for ids, datas, frame, timestamp in self.generate_detections():
             print(
                 'Timestamp:', datetime.datetime.fromtimestamp(
-                    timestamp,
+                    timestamp, tz=datetime.timezone.utc
                 ).strftime('%Y-%m-%d %H:%M:%S'),
             )
             print('IDs:', ids)

tests/live_stream_tracker_test.py

@@ -61,7 +61,7 @@ def test_generate_detections(
         mock_results[0].boxes = mock_boxes
         mock_yolo_instance.track.return_value = mock_results
 
-        mock_now = datetime.datetime(2023, 1, 1, 0, 0, 0)
+        mock_now = datetime.datetime(2023, 1, 1, 0, 0, 0, tzinfo=datetime.timezone.utc)
         mock_datetime.datetime.now.side_effect = [mock_now, mock_now]
 
         frame_generator = self.detector.generate_detections()
@@ -98,9 +98,10 @@ def test_run_detection(self, mock_generate_detections):
 
         with patch('builtins.print') as mock_print:
             self.detector.run_detection()
+            expected_datetime = datetime.datetime.fromtimestamp(1234567890.0, tz=datetime.timezone.utc).strftime('%Y-%m-%d %H:%M:%S')
             self.assertTrue(
                 any(
-                    'Timestamp:' in str(call) and '2009-02-14' in str(call)
+                    'Timestamp:' in str(call) and expected_datetime in str(call)
                     for call in mock_print.call_args_list
                 ),
             )