def test_ADmath_sqrtr():
f = ADmath.sqrt(40)
assert f == np.sqrt(40)
def test_ADmath_sqrt():
f = ADmath.sqrt(ADnum(40, der=1))
assert f.val == np.sqrt(40)
assert f.der == 1 / (2 * np.sqrt(40))
assert len(f.graph) == 1