Fixing mocked data dir in testing

tests/test_setup.py

 import tempfile
-import requests
+import os
 import threading
 import time
 from polygonqueryonraster.app import GeoTIFFService
@@ -7,24 +7,27 @@ from polygonqueryonraster.app import GeoTIFFService
 def test_flask_app():
     # Create a temporary directory for testing
     with tempfile.TemporaryDirectory() as tempdir:
-        # Create a dummy subdirectory in the temporary directory to avoid StopIteration
+        # Optionally, create a dummy subdirectory in the temporary directory to simulate subdirectories
         os.makedirs(os.path.join(tempdir, 'dummy_subdir'))
 
-        # Start the Flask app
+        # Initialize the service with the temporary directory
         service = GeoTIFFService(tempdir, port=5001)
+
+        # Start the Flask app in a separate thread
         thread = threading.Thread(target=service.run)
         thread.start()
 
-        # Give it time to start
+        # Give the server some time to start
         time.sleep(2)
 
         try:
-            # Send a request to the Flask API
+            # Test that the Flask app responds correctly
+            import requests
             response = requests.get('http://127.0.0.1:5001/api')
             assert response.status_code == 200
             assert response.json()["message"] == "Hello, this is a simple REST API!"
         finally:
-            # Stop the Flask server
+            # Stop the Flask app
             thread.join(timeout=1)
 
 if __name__ == '__main__':