diff --git a/tests/laborious/activities/test_gates.py b/tests/laborious/activities/test_gates.py
index 19d52cd..e1ba49d 100644
--- a/tests/laborious/activities/test_gates.py
+++ b/tests/laborious/activities/test_gates.py
@@ -402,3 +402,42 @@ async def test_get_last_timestamp_no_data(gates_activity):
     # Assert
     assert isinstance(result, str)  # Should be a timestamp string
     assert len(result) > 0
+
+
+@mark.asyncio
+@patch('laborious.activities.gates.metrics')
+async def test_write_metrics(mock_metrics, gates_activity):
+    """Test write_metrics method."""
+    input_data = {
+        **metadata,
+        'prediction': {
+            'prediction': [1, 2, 3],
+            'prediction_confidence': [0.9, 0.8, 0.7],
+            'response_time': [0.1, 0.2, 0.3]
+        }
+    }
+    await gates_activity.write_metrics(input_data)
+    mock_metrics.PREDICTIONS_WRITTEN_COUNT.labels.assert_called_once_with(
+        pod_id=gates_activity.pod_id,
+        model_name=metadata['metadata']['model_name'],
+        pipeline_name=metadata['metadata']['workflow_name']
+    )
+    mock_metrics.PREDICTIONS_WRITTEN_COUNT.labels.return_value.inc.assert_called_once_with()
+
+    mock_metrics.PREDICTION_CONFIDENCE_MONITOR.labels.assert_called_once_with(
+        pod_id=gates_activity.pod_id,
+        model_name=metadata['metadata']['model_name'],
+        pipeline_name=metadata['metadata']['workflow_name']
+    )
+    mock_metrics.PREDICTION_CONFIDENCE_MONITOR.labels.return_value.set.assert_called_once_with(
+        0.9
+    )
+
+    mock_metrics.PREDICTION_RESPONSE_TIME_MONITOR.labels.assert_called_once_with(
+        pod_id=gates_activity.pod_id,
+        model_name=metadata['metadata']['model_name'],
+        pipeline_name=metadata['metadata']['workflow_name']
+    )
+    mock_metrics.PREDICTION_RESPONSE_TIME_MONITOR.labels.return_value.observe.assert_called_once_with(
+        0.1
+    )