def METHOD_NAME(mock_tools, android_sdk, host_os, emulator_name):
    """Validate that if the user is on Windows, we run `emulator.bat`, otherwise,
    `emulator`."""
    # Mock out `host_os` so we can test Windows when not on Windows.
    mock_tools.host_os = host_os
    assert android_sdk.emulator_path == (
        android_sdk.root_path / "emulator" / emulator_name
    )