How to use the ward.util.ExitCode function in ward

def _(example=example_test):
    test_results = [
        TestResult(test=example, outcome=TestOutcome.PASS),
        TestResult(test=example, outcome=TestOutcome.SKIP),
        TestResult(test=example, outcome=TestOutcome.XFAIL),
    ]
    exit_code = get_exit_code(test_results)

    expect(exit_code).equals(ExitCode.SUCCESS)

def _(example=example_test):
    test_results = [
        TestResult(test=example, outcome=TestOutcome.XPASS),
        TestResult(test=example, outcome=TestOutcome.PASS),
    ]
    exit_code = get_exit_code(test_results)

    expect(exit_code).equals(ExitCode.FAILED)

def get_exit_code(results: Iterable[TestResult]) -> ExitCode:
    if not results:
        return ExitCode.NO_TESTS_FOUND

    if any(
        r.outcome == TestOutcome.FAIL or r.outcome == TestOutcome.XPASS for r in results
    ):
        exit_code = ExitCode.FAILED
    else:
        exit_code = ExitCode.SUCCESS
    return exit_code

def get_exit_code(results: Iterable[TestResult]) -> ExitCode:
    if not results:
        return ExitCode.NO_TESTS_FOUND

    if any(
        r.outcome == TestOutcome.FAIL or r.outcome == TestOutcome.XPASS for r in results
    ):
        exit_code = ExitCode.FAILED
    else:
        exit_code = ExitCode.SUCCESS
    return exit_code

def output_test_result_summary(
        self, test_results: List[TestResult], time_taken: float
    ):
        outcome_counts = self._get_outcome_counts(test_results)
        if test_results:
            chart = self.generate_chart(
                num_passed=outcome_counts[TestOutcome.PASS],
                num_failed=outcome_counts[TestOutcome.FAIL],
                num_skipped=outcome_counts[TestOutcome.SKIP],
                num_xfail=outcome_counts[TestOutcome.XFAIL],
                num_unexp=outcome_counts[TestOutcome.XPASS],
            )
            print(chart, "")

        exit_code = get_exit_code(test_results)
        if exit_code == ExitCode.SUCCESS:
            result = colored(exit_code.name, color="green")
        else:
            result = colored(exit_code.name, color="red")

        output = f"{result} in {time_taken:.2f} seconds"
        if test_results:
            output += " [ "

        if outcome_counts[TestOutcome.FAIL]:
            output += f"{colored(str(outcome_counts[TestOutcome.FAIL]) + ' failed', color='red')}  "
        if outcome_counts[TestOutcome.XPASS]:
            output += f"{colored(str(outcome_counts[TestOutcome.XPASS]) + ' xpassed', color='yellow')}  "
        if outcome_counts[TestOutcome.XFAIL]:
            output += f"{colored(str(outcome_counts[TestOutcome.XFAIL]) + ' xfailed', color='magenta')}  "
        if outcome_counts[TestOutcome.SKIP]:
            output += f"{colored(str(outcome_counts[TestOutcome.SKIP]) + ' skipped', color='blue')}  "

def get_exit_code(results: Iterable[TestResult]) -> ExitCode:
    if not results:
        return ExitCode.NO_TESTS_FOUND

    if any(
        r.outcome == TestOutcome.FAIL or r.outcome == TestOutcome.XPASS for r in results
    ):
        exit_code = ExitCode.FAILED
    else:
        exit_code = ExitCode.SUCCESS
    return exit_code