fix: resolve linting errors and add license header

Author: hebaalazzeh

packages/google-auth/google/auth/transport/__init__.py

@@ -121,9 +121,12 @@ def __call__(
         # (pylint doesn't play well with abstract docstrings.)
         raise NotImplementedError("__call__ must be implemented.")
 
-import sys
+
+import sys  # noqa: E402
+
 if sys.version_info < (3, 15):
     import importlib
+
     for _lazy_mod in __lazy_modules__:
         try:
             importlib.import_module(_lazy_mod)

packages/google-auth/tests/transport/test_lazy_imports.py

@@ -1,3 +1,17 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import sys
 import pytest
 
@@ -8,36 +22,41 @@
     "google.auth.transport.grpc",
 ]
 
+
 def clean_sys_modules():
     """Helper to ensure we start with a clean slate for import testing."""
     for mod in LAZY_MODULES:
         sys.modules.pop(mod, None)
 
+
 @pytest.mark.skipif(sys.version_info < (3, 15), reason="PEP 810 requires Python 3.15+")
 def test_lazy_imports_on_python_315():
     clean_sys_modules()
-    
+
     # 1. Import the transport package
-    import google.auth.transport
-    
+    import google.auth.transport  # noqa: F401
+
     # 2. Assert that none of the lazy modules have been eagerly loaded into sys.modules
     for mod in LAZY_MODULES:
         assert mod not in sys.modules
-        
+
     # 3. Access an attribute to trigger reification
     from google.auth.transport import requests
+
     _ = requests.__name__  # Trigger first-use reification
-    
+
     # 4. Assert that the module has now been reified and loaded
     assert "google.auth.transport.requests" in sys.modules
 
 
-@pytest.mark.skipif(sys.version_info >= (3, 15), reason="Testing fallback behavior on < 3.15")
+@pytest.mark.skipif(
+    sys.version_info >= (3, 15), reason="Testing fallback behavior on < 3.15"
+)
 def test_fallback_eager_imports_pre_315():
     clean_sys_modules()
-    
+
     # On older Python, __lazy_modules__ is safely ignored, meaning they should eager-load
-    import google.auth.transport
-    
+    import google.auth.transport  # noqa: F401
+
     for mod in LAZY_MODULES:
         assert mod in sys.modules