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:

public class RetryTest {
    public class RetryRule implements TestRule {
        ...
        public Statement apply(Statement base, Description description) {
            ...
        }
        ...
    }
}

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

public Statement apply(Statement, Description) {
    return new Statement() {
        @Override
        public void evaluate() throws Throwable {
            ...
            for (int i = 0; i 
Using the RetryRule
Annotate your test class with the Rule like this:
...
@Rule
public Retry rule = new Retry(3);
...
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.