fix: lint fixes and typo fixes

Signed-off-by: Radhika Agrawal <agrawalradhika@google.com>

Author: agrawalradhika-cell

google/auth/aio/transport/mtls.py

@@ -20,7 +20,6 @@
 import contextlib
 import logging
 import os
-from os import getenv, path
 import ssl
 import tempfile
 from typing import Optional
@@ -30,6 +29,7 @@
 
 _LOGGER = logging.getLogger(__name__)
 
+
 @contextlib.contextmanager
 def _create_temp_file(content: bytes):
     """Creates a temporary file with the given content.
@@ -84,6 +84,7 @@ def make_client_cert_ssl_context(
             "Failed to load client certificate and key for mTLS."
         ) from exc
 
+
 async def _run_in_executor(func, *args):
     """Run a blocking function in an executor to avoid blocking the event loop.
 

google/auth/transport/mtls.py

@@ -20,7 +20,7 @@
 from google.auth.transport import _mtls_helper
 
 
-def has_default_client_cert_source(include_context_aware):
+def has_default_client_cert_source(include_context_aware=True):
     """Check if default client SSL credentials exists on the device.
 
     Args:

tests/transport/aio/test_sessions_mtls.py

@@ -99,7 +99,7 @@ async def test_configure_mtls_channel_invalid_format(self, mock_file, mock_exist
     @pytest.mark.asyncio
     @mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"})
     @mock.patch(
-        "google.auth.aio.transport.mtls.has_default_client_cert_source",
+        "google.auth.transport.mtls.has_default_client_cert_source",
         return_value=True,
     )
     async def test_configure_mtls_channel_mock_callback(self, mock_has_cert):