tests/conftest.py

import sys
import types


def _install_audio_separator_stub() -> None:
    try:
        import audio_separator.separator  # noqa: F401
        return
    except ModuleNotFoundError:
        pass
    separator_module = types.ModuleType("audio_separator.separator")
    separator_module.Separator = type("Separator", (), {})
    package_module = types.ModuleType("audio_separator")
    package_module.separator = separator_module
    sys.modules.setdefault("audio_separator", package_module)
    sys.modules.setdefault("audio_separator.separator", separator_module)


_install_audio_separator_stub()