def METHOD_NAME(self):
    r = Renderer()
    assert len(r.disabled_fields) == 0
    assert len(r.error_fields) == 0
    r.set_error_fields(["one", "two"])
    r.set_disabled_fields(["three", "four"])
    assert len(r.error_fields) == 2
    assert "one" in r.error_fields
    assert "two" in r.error_fields
    assert len(r.disabled_fields) == 2
    assert "three" in r.disabled_fields
    assert "four" in r.disabled_fields