______________________ test_linear_fit_model_set_weights _______________________

    def test_linear_fit_model_set_weights():
       […]
        with pytest.warns(RuntimeWarning,
                          match=r'invalid value encountered in true_divide'):
>           fitted_model = fitter(init_model, x,
                                  np.ma.array(y, mask=np.isclose(weights, 0)),
                                  weights=weights)
E           Failed: DID NOT WARN. No warnings of type (<class 'RuntimeWarning'>,) was emitted. The list of emitted warnings is: [].

astropy/modeling/tests/test_model_sets.py:392: Failed

____________________ test_blackbody_exceptions_and_warnings ____________________

    def test_blackbody_exceptions_and_warnings():
        […]
        with pytest.warns(AstropyUserWarning, match='invalid') as w:
            bb(0 * u.AA)
>       assert len(w) == 3  # 2 of these are RuntimeWarning from zero divide
E       assert 1 == 3
E        +  where 1 = len(WarningsChecker(record=True))

astropy/modeling/tests/test_physical_models.py:119: AssertionError