def test__is_constant_false(self):
distribution = BetaUnivariate()
distribution.fit(np.array([1, 2, 3, 4]))
assert not distribution._is_constant()
def test__is_constant_true(self):
distribution = BetaUnivariate()
distribution.fit(np.array([1, 1, 1, 1]))
assert distribution._is_constant()