diff --git a/tests/test_pipelines.py b/tests/test_pipelines.py
index b1387b7..e1e8b1e 100644
--- a/tests/test_pipelines.py
+++ b/tests/test_pipelines.py
@@ -1,17 +1,15 @@
-import importlib
 import json
 from unittest.mock import patch
 
 import pytest
 import sqlalchemy as sql
 
-import delta_barth.pipelines
 from delta_barth import databases as db
 from delta_barth import pipelines as pl
 from delta_barth.errors import STATUS_HANDLER
 
 
-def test_write_performance_metrics(session):
+def test_write_performance_metrics_Success(session):
     pipe_name = "test_pipe"
     t_start = 20_000_000_000
     t_end = 30_000_000_000
@@ -33,6 +31,20 @@ def test_write_performance_metrics(session):
     assert metrics.execution_duration == 10
 
 
+def test_write_performance_metrics_FailStartingTime(session):
+    pipe_name = "test_pipe"
+    t_start = 30_000_000_000
+    t_end = 20_000_000_000
+
+    with patch("delta_barth.pipelines.SESSION", session):
+        with pytest.raises(ValueError):
+            _ = pl._write_performance_metrics(
+                pipeline_name=pipe_name,
+                time_start=t_start,
+                time_end=t_end,
+            )
+
+
 @patch("delta_barth.analysis.forecast.SALES_BASE_NUM_DATAPOINTS_MONTHS", 1)
 def test_sales_prognosis_pipeline(exmpl_api_sales_prognosis_resp, session):
     with patch(