def test_arcsin_result_var():
val = 0
x = Variable('x', val)
obj_generate = elem.arcsin(x)
obj_wanted = Variable('x', np.arcsin(val), 1 / np.sqrt(1 - val**2),
val / (1 - val**2)**(3 / 2))
assert np.isclose(obj_generate.val, obj_wanted.val)
## ensure same element
assert list(obj_generate.der) == list(obj_wanted.der)
## ensure same value
assert sum(
list(
map(
lambda x: not np.isclose(obj_generate.der[x], obj_wanted.der[x]
), obj_generate.der))) == 0
def test_arcsin_types():
with pytest.raises(TypeError):
elem.arcsin("hi")
def test_arcsin_result_var_notvalid():
val = 2
x = Variable('x', val)
with pytest.raises(ValueError):
obj_generate = elem.arcsin(x)
def test_arcsin_result_constant_notvalid():
with pytest.raises(ValueError):
elem.arcsin(2.0)
def test_arcsin_result_constant():
assert np.isclose(elem.arcsin(1.0), np.arcsin(1.0))