'Test that a change to one single parameter in a set propagates to
param_sets.'

def test_change_par2(self):

    self.gmodel.amplitude[0] = 11
    utils.assert_almost_equal(self.gmodel.param_sets, np.array([[11.0, 10], [3.5, 5.2], [0.4, 0.7]]))
    np.all((self.gmodel.parameters == [11.0, 10.0, 3.5, 5.2, 0.4, 0.7]))
