def METHOD_NAME():
    assert False == check_field_exists(data_dict, None)
    assert False == check_field_exists(None, 'c.d')
    assert False == check_field_exists(data_dict, 'c.d.e')
    assert True == check_field_exists(data_dict, 'a')
    assert True == check_field_exists(data_dict, 'c.d')
    assert True == check_field_exists(data_dict, 'f.g.h')