How to Automatically Re-run Failing JUnit Tests?

Re-running Failed JUnit Tests Automatically

In JUnit, encountering failing tests can be frustrating when the failures are intermittent due to slight variations in system performance. To address this, we may want to provide a second chance to failing tests by attempting to run them again.

One solution is to utilize a TestRule, which allows custom logic to be inserted around test execution. The custom TestRule can implement a retry loop, allowing the test to be run multiple times (e.g., three times).

<code class="java">public class RetryTest {
    public class Retry implements TestRule {...}
    @Rule public Retry retry = new Retry(3);
    @Test public void test1() {...}
}</code>

In this example, the Retry rule retries the test up to three times if it fails. If the test passes on any of the retries, it will be marked as successful.

Another option is to create a custom TestRunner. By extending BlockJUnit4ClassRunner and overriding the runChild() method, you can define custom logic to handle failing tests.

Both the TestRule and custom TestRunner approaches provide flexibility in defining the retry logic and customizing the test execution based on specific requirements.

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