def METHOD_NAME():
    assert None == get_field_value(data_dict, None)
    assert None == get_field_value(None, 'c.d')
    assert None == get_field_value(data_dict, 'c.d.e')
    assert 'b' == get_field_value(data_dict, 'a')
    assert 'e' == get_field_value(data_dict, 'c.d')
    assert 1 == get_field_value(data_dict, 'f.g.h')
    assert {'h': 1} == get_field_value(data_dict, 'f.g')