need to unlink the original file

Author: debonisd

test/tests/builder_tests.py

@@ -291,6 +291,9 @@ def test_src_urls(self):
         self._quick_test(config, build=False, finalize=False)
         self.assertEqual(orig_time, expected_path.stat().st_mtime)
 
+        if expected_path.exists():
+            expected_path.unlink()
+
         # Here it should be updated. We're playing a weird trick here though,
         # by pointing to a completely different url.
         config = copy.deepcopy(config)