def METHOD_NAME():
    """Test for wideband fitter class F-test."""
    wb_m = tm.get_model(os.path.join(datadir, "J0023+0923_ell1_simple.par"))
    wb_t = simulation.make_fake_toas_uniform(
        56000.0, 56001.0, 10, wb_m, freq=1400.0 * u.MHz, obs="GBT", wideband=True
    )
    wb_f = fitter.WidebandTOAFitter(wb_t, wb_m)
    wb_f.fit_toas()
    # Parallax
    PX = param.floatParameter(
        parameter_type="float", name="PX", value=0.0, units=u.mas, frozen=False
    )
    PX_Component = "AstrometryEcliptic"
    # A1DOT
    A1DOT = param.floatParameter(
        parameter_type="float",
        name="A1DOT",
        value=0.0,
        units=ls / u.second,
        frozen=False,
    )
    A1DOT_Component = "BinaryELL1"
    # Test adding A1DOT
    Ftest_dict = wb_f.ftest(A1DOT, A1DOT_Component, remove=False, full_output=True)
    assert isinstance(Ftest_dict["ft"], (float, bool))
    # Test removing parallax
    Ftest_dict = wb_f.ftest(PX, PX_Component, remove=True, full_output=True)
    assert isinstance(Ftest_dict["ft"], (float, bool))