46c1ae8b24
All four failures were broken by the security cluster (#10082 / #10133 / #4609 / symlink-reject batch) merging on May 25. They were red on origin/main HEAD when #32042 and #32061 ran, gating PRs that touched unrelated code. 1) tests/hermes_cli/test_update_zip_symlink_reject.py test_update_via_zip_accepts_normal_member called the real _update_via_zip without sandboxing PROJECT_ROOT — so the function's shutil.copytree() actually copied the fake README from the test ZIP over the real repo's README.md, which then made test_readme_mentions_powershell_installer fail in any test run that happened to pick this test up earlier. Mock PROJECT_ROOT to an isolated tmp_path / install_dir, stub subprocess so pip/uv reinstall doesn't actually run, and assert the fake README lands in the sandbox (not the real tree). 2) tests/tools/test_windows_native_support.py test_readme_mentions_powershell_installer was the victim of (1) — nothing wrong with the test itself, the fix in (1) clears it. 3) tests/tools/test_file_read_guards.py test_proc_fd_other_not_blocked called _is_blocked_device('/proc/self/fd/3') expecting False. But _is_blocked_device runs realpath() and on pytest xdist workers fd 3 happens to be dup'd to /dev/urandom (because the worker subprocess inherits open fds from pytest's collection pipe machinery). Switch to the lower-level _is_blocked_device_path which is the path-pattern check the test actually means to exercise; realpath-resolution coverage already lives in test_symlink_to_blocked_device_is_blocked. 4) tests/tools/test_transcription_tools.py Module installed a faster_whisper stub via sys.modules without setting __spec__, then later @pytest.mark.skipif called importlib.util.find_spec('faster_whisper') which raises 'ValueError: __spec__ is None' for modules with a None spec attr. Set __spec__ on the stub to a real ModuleSpec. Validation: 195/195 green across the 4 affected files.