test: had a check for the env file in integration tests

tests/integration/__init__.py

@@ -1,8 +1,13 @@
 """Integration tests."""
+import os
 
 from dotenv import load_dotenv
 
-load_dotenv("pytest.env")
+dotenv_file = "pytest.env"
+if not os.path.isfile(dotenv_file):
+    raise FileNotFoundError(f"Tests: File '{dotenv_file}' not found.")
+
+load_dotenv(dotenv_file)
 print("Loaded pytest.env")
 
 import logging