def test_asin(): a = asin(interval(-0.5, 0.5)) assert a.start == np.arcsin(-0.5) assert a.end == np.arcsin(0.5) a = asin(interval(-1.5, 1.5)) assert a.is_valid is None a = asin(interval(-2, -1.5)) assert a.is_valid is False a = asin(interval(0, 2)) assert a.is_valid is None a = asin(interval(2, 5)) assert a.is_valid is False a = asin(0.5) assert a.start == np.arcsin(0.5) assert a.end == np.arcsin(0.5) a = asin(1.5) assert a.is_valid is False