Bagaimana Anda Boleh Menangani Kegagalan Sementara dalam Ujian JUnit dengan Peraturan Cuba Semula?

<code class="java">public class Retry implements TestRule {
    private int retryCount;

    public Retry(int retryCount) {
        this.retryCount = retryCount;
    }

    public Statement apply(Statement base, Description description) {
        return statement(base, description);
    }

    private Statement statement(final Statement base, final Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                Throwable caughtThrowable = null;

                // Retry loop
                for (int i = 0; i < retryCount; i++) {
                    try {
                        base.evaluate();
                        return;
                    } catch (Throwable t) {
                        caughtThrowable = t;
                        System.err.println(description.getDisplayName() + ": run " + (i+1) + " failed");
                    }
                }
                System.err.println(description.getDisplayName() + ": giving up after " + retryCount + " failures");
                throw caughtThrowable;
            }
        };
    }
}</code>

<code class="java">public class RetryTest {
    @Rule
    public Retry retry = new Retry(3);

    // Test methods...
}</code>