Update packages/google-cloud-storage/tests/unit/test_client.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: chalmerlowe

packages/google-cloud-storage/tests/unit/test_client.py

@@ -300,7 +300,7 @@ def test_ctor_wo_project(self):
         PROJECT = "PROJECT"
         credentials = _make_credentials(project=PROJECT)
 
-        with mock.patch("os.environ", {}):
+        with mock.patch.dict("os.environ", {}, clear=True):
             client = self._make_one(credentials=credentials)
 
         self.assertEqual(client.project, PROJECT)