Function assert_raises

extra_tests/snippets/testutils.py:5–12

(expected, *args, _msg=None, **kw)

def assert_raises(expected, *args, _msg=None, **kw):
    if args:
        f, f_args = args[0], args[1:]
        with AssertRaises(expected, _msg):
            f(*f_args, **kw)
    else:
        assert not kw
        return AssertRaises(expected, _msg)


class AssertRaises: