def METHOD_NAME():
    """Test the kwargs of estimate_mass."""
    M = estimate_mass(cnumax, cdeltanu, cteff, cenumax, cedeltanu, ceteff)
    # Check units
    assert M.unit == u.solMass
    assert M.error.unit == u.solMass
    # Check returns right answer
    assert_correct_answer(M, cM)
    # Check units on parameters
    M = estimate_mass(
        cnumax, cdeltanu, cteff, u.Quantity(cenumax, u.microhertz), cedeltanu, ceteff
    )
    assert_correct_answer(M, cM)
    M = estimate_mass(
        cnumax, cdeltanu, cteff, cenumax, u.Quantity(cedeltanu, u.microhertz), ceteff
    )
    assert_correct_answer(M, cM)
    M = estimate_mass(
        cnumax, cdeltanu, cteff, cenumax, cedeltanu, u.Quantity(ceteff, u.Kelvin)
    )
    assert_correct_answer(M, cM)
    # Check works with a random selection of appropriate units
    M = estimate_mass(
        cnumax,
        cdeltanu,
        cteff,
        u.Quantity(cenumax, u.microhertz).to(1 / u.day),
        u.Quantity(cedeltanu, u.microhertz).to(u.hertz),
        ceteff,
    )
    assert_correct_answer(M, cM)