def test_names():
assert Add(x, 1)._name == x._name
assert Add(1, x)._name == x._name
assert Mult(Add(1, x), 2)._name == x._name
assert Add(y, x)._name != x._name
assert Add(y, x)._name != y._name
assert Add(x, x)._name == x._name
def test_arithmetic_broadcasts_to_scalars():
assert Add(x, a).shape == x.shape
assert Add(x, 1).shape == x.shape
def test_arithmetic_dshape_on_collections():
assert Add(x, y).shape == x.shape == y.shape