def METHOD_NAME(self):
    """Test _apply_fx_mask func."""
    dummy_fx_mask = np.ma.array((True, False, True))
    app_mask = _apply_fx_mask(dummy_fx_mask,
                              self.time_cube.data[0:3].astype('float64'))
    fixed_mask = np.ma.array(self.time_cube.data[0:3].astype('float64'),
                             mask=dummy_fx_mask)
    self.assert_array_equal(fixed_mask, app_mask)