JUnit Listeners


If you want to do some operations when your tests are started, passed, finished, failed, or skipped/ignored, you can use Listeners. Both JUnit and TestNG provide us Listeners, and in this article, I will explain how to add JUnit Listeners in your automation framework.

Listeners listen and handle events while your automation code is running. We can add a listener by creating a custom Runner. Then, we can use this custom runner in our test class with @RunWith annotation.

First, let’s write our Listener class by extending JUnit’s RunListener class and overriding its methods. I called our listener class as MyExecutionListener.

MyExecutionListener.java

Second, we need to add the listener to the test execution. We can add the listener by calling the RunNotifier.addListener() method. This will register our JUnit Listener. I faced with a problem when I tried to use RunListener class’s testRunStarted method. Then, I found a solution that triggers this method after registering the listener in the run method. I wrote a comment about this solution in below code.

MyTestRunner.java

Third, we need to write a test to verify our listener’s functionality. We register our custom runner with @RunWith(MyTestRunner.class) annotation and for alphabetic test execution, we add @FixMethodOrder(MethodSorters.NAME_ASCENDING) annotation.

Extra: Also, you can combine listeners with custom Retry Rule which described in other JUnit article. Thus, when your test fails, it will rerun the failed test according to given retry count.

ListenerExampleTest.java

Result:

junit listeners

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About the Author:

Onur Baskirt
Onur Baskirt is a senior IT professional with 10+ years of experience. He worked at Bahçesehir University, ST Microelectronics, Huawei and Ericsson as research assistant, design verification engineer and software test leader. Also, he worked as software test leader and software operations manager at Turkey's biggest technology retailer, Teknosa. Now, he is working as Head of Software Testing and Manager of two Development Teams at Kariyer.net. His current research areas are technical software testing, programming, and computer science. Formerly, he has several research works and papers on digital chip design & verification. His hobbies are sport, dancing, traveling, and nutrition. You can find detailed information about him on his linked-in page.

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