def METHOD_NAME(self):
    fitter = WidebandTOAFitter([self.toas], self.model, additional_args={})
    # test making residuals
    assert len(fitter.resids._combined_resids) == 2 * self.toas.ntoas
    # test additional args
    add_args = {"toa": {"subtract_mean": False}}
    fitter2 = WidebandTOAFitter([self.toas], self.model, additional_args=add_args)
    assert fitter2.resids.toa.subtract_mean == False