def METHOD_NAME(source_tree):
    # type: (SourceTree) -> None
    source_tree.assert_sources(
        pex_args=["-P", "top_level_package_mixed.sub"],
        expected_sources=[
            "top_level_package_mixed/",
            "top_level_package_mixed/sub/",
            "top_level_package_mixed/sub/__init__.py",
            "top_level_package_mixed/sub/module.py",
        ],
    )