def configuration(parent_package='', top_path=None):
    from numpy.distutils.misc_util import Configuration
    config = Configuration('array_api', parent_package, top_path)
    config.add_subpackage('tests')
    return config


if __name__ == '__main__':
    from numpy.distutils.core import setup
    setup(configuration=configuration)

Add a setup.py to the array_api submodule