check( <fn_to_test> )( <fn_args> )( <expected_return> )

check.py

def check(fn):
    def run_check(expected, *args):
        result = fn(*args)

        if result == expected:
            print("Test passed: " + fn.__name__ + str(args) + ' == ' + str(expected))
        else:
            print("Test failed: " + fn.__name__ + str(args))
            print("  - Expected: " + str(expected))
            print("  - Received: " + str(result))

    return lambda *args: lambda expected: run_check(expected, *args)