How to Retry Failed JUnit Tests Instantly?

Retry Failed JUnit Tests Instantly

Trying to handle infrequent test failures due to time-sensitive actions in large test suites can be frustrating. The good news is that you can implement a TestRule to retry failed tests.

Creating a RetryRule

A TestRule gives you control over test execution. To create a RetryRule, define a class like this:

<code class="java">public class RetryTest {
    public class RetryRule implements TestRule {
        ...
        public Statement apply(Statement base, Description description) {
            ...
        }
        ...
    }
}</code>

In the apply method, insert your retry logic around the test call using the provided base.evaluate():

<code class="java">public Statement apply(Statement, Description) {
    return new Statement() {
        @Override
        public void evaluate() throws Throwable {
            ...
            for (int i = 0; i < retryCount; i++) {
                ...
            }
            ...
        }
    };
}</code>

Using the RetryRule

Annotate your test class with the Rule like this:

<code class="java">...
@Rule
public Retry rule = new Retry(3);
...</code>

Other Options

Custom TestRunner:

Alternatively, you can create a custom TestRunner that extends BlockJUnit4ClassRunner and overrides runChild() to implement the retry mechanism.

Note:

• The RetryRule allows you to specify the number of retries, while the custom TestRunner does not.
• You can also use annotations to apply the retry logic selectively.

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