def operands_of_mul_operation_must_support_mul():
type_bindings = {"x": types.none_type, "y": types.none_type}
multiplication = nodes.mul(nodes.ref("x"), nodes.ref("y"))
try:
infer(multiplication, type_bindings=type_bindings)
assert False, "Expected error"
except errors.NoSuchAttributeError as error:
assert_equal(nodes.attr(multiplication.left, "__mul__"), error.node)
assert_equal(multiplication.left, ephemeral.root_node(error.node))
def can_infer_type_of_multiplication_operation():
type_bindings = {"x": types.int_type, "y": types.int_type}
multiplication = nodes.mul(nodes.ref("x"), nodes.ref("y"))
assert_equal(types.int_type, infer(multiplication, type_bindings=type_bindings))
def test_parse_multiplication():
expected = nodes.mul(nodes.ref("x"), nodes.ref("y"))
_assert_expression_parse(expected, "x * y")
