def METHOD_NAME(self, system_frame):
    m = system_frame
    set_operating_conditions(m)
    initialize_system(m)
    # test feed water flow
    assert value(m.fs.feed.properties[0].flow_mass_comp["H2O"]) == pytest.approx(
        13127.656969, rel=1e-3
    )
    assert value(m.fs.feed.properties[0].flow_mass_comp["tss"]) == pytest.approx(
        3.193938, rel=1e-5
    )
    assert value(m.fs.feed.properties[0].flow_mass_comp["cod"]) == pytest.approx(
        3.52794065556, abs=1e-10
    )
    assert value(m.fs.feed.properties[0].flow_mass_comp["oxygen"]) == pytest.approx(
        9.3989169, rel=1e-5
    )
    assert value(
        m.fs.feed.properties[0].flow_mass_comp["carbon_dioxide"]
    ) == pytest.approx(1.3143778e-5, abs=1e-10)