Fail of query_string

[lk-geimfari]

 ______________________ TestInternet.test_query_string[8] _______________________

self = <tests.test_providers.test_internet.TestInternet object at 0x7f6d503de0a0>
net = <mimesis.providers.internet.Internet object at 0x7f6d503ded00>, length = 8

    @pytest.mark.parametrize("length", [4, 6, 8, None])
    def test_query_string(self, net, length):
        query_string = net.query_string(length)
        query_params_count = len(query_string.split("&"))
    
        if length is None:
            assert 1 <= query_params_count <= 10
        else:
>           assert query_params_count == length
E           assert 7 == 8

tests/test_providers/test_internet.py:118: AssertionError