Tests in TestReadClaudeCodeCredentials were not mocking
_read_claude_code_credentials_from_keychain, which was added after the
tests were written. On macOS machines with real Claude Code credentials
stored in the Keychain, the function returns live credentials instead of
the test fixtures, causing assertions to fail and leaking real tokens in
test output.
Add an autouse fixture that stubs the keychain reader to None so all
tests in the class exercise only the file-based credential path.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Rahul
a52f014a8c