async def test_bcf8(http_client):
    """
    MAY use 400 status code on JSON parsing failure
    """
    response = await http_client.post(
        url="/graphql",
        headers={"Content-Type": "application/json"},
        data=b'{ "not a JSON',
    )
    assert response.status_code == 400

    MAY use 400 status code on JSON parsing failure
    
tests/http/test_graphql_over_http_spec.py