Re-running the failed test script using JUnit

Agenda of this blog: To discuss about how to re-run your failed automation scripts without any manual interference using JUnit- Unit test framework.

What is the need: When you write your automation script it might happen that some of your test script may get failed due any reason, it might be due to some internet issues, or UI issues or locator changes or might be some issue with the coding itself or some sporadic issues. So in that case we may need to re-run the failed test case without triggering those again manually. This feature is supported by your Unit test framework TestNg/JUnit, here we will be discussing considering the JUnit as the Unit test Framework.

 Approach we will follow is:

1. Write a class which will be having the implementation of the retry functionalities by using a listener for JUnit i.e TestRule .A TestRule is an alteration of how a test method, or set of test methods, is run and reported.

      2.  Then use the implemented feature in your tests by using @Rule which is part of JUnit: Basically Rules allow very flexible addition or redefinition of the behavior of each test method in a test class. Testers can reuse or extend Rules, or can write their own.

Now let us have a look at the code snippet:

package com.junitRetry;

import org.junit.Assert;

import org.junit.Rule;

import org.junit.Test;

import org.junit.rules.TestRule;

import org.junit.runner.Description;

import org.junit.runners.model.Statement;

public class RetryAnalyzer {

           

             public class Retry implements TestRule {

                    private int retryCount;

                    public Retry(int retryCount) {

                        this.retryCount = retryCount;

                    }

                 

                    public Statement apply(final Statement base, final Description description) {

                        return new Statement() {

                            @Override

                            public void evaluate() throws Throwable {

                                Throwable caughtThrowable = null;

                                //Retry logic goes here

                                for (int i = 0; i < retryCount; i++) {

                                    try {

                                        base.evaluate();

                                        return;

                                    } catch (Throwable ex) {

                                        caughtThrowable = ex;

                                        System.err.println(description.getDisplayName() + ": run iteration number " + (i+1) + " failed");

                                    }

                                }

                                System.err.println(description.getDisplayName() + ": Quiting after " + retryCount + " failures");

                                throw caughtThrowable;

                            }

                        };

                    }

                }

                @Rule

                public Retry retry = new Retry(4);

                @Test

                public void test1() {

                       

                        System.out.println("Test Passed");

                }

                @Test

                public void test2() {

                        System.out.println("FAILED test");

                        Assert.fail();

                }

}



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