How to write a custom Junit runner that will log results

Question

I am working with JUnit and I have this idea which I want to implement. I want to write a runner that will log the results of each test to an excel or a text file so that i can attach it in my reports. What do i need to learn to get started

Answer 1

Two alternatives

1. Write a RunListener and use it like:

   public void main(String... args) { 
       JUnitCore core= new JUnitCore();
       core.addListener(new MyRunListener());
       core.run(MyTestClass.class);
   }
   

2. Write a RunListener again. But this time extend an org.junit.runner.Runner implementation and override its run method like

   @Override
   public void run(RunNotifier notifier) {
       notifier.addListener(new MyRunNotifier());
       super.run(notifier);
   }
   

Second approach can also be used in tests with @RunWith(MyRunner.class) annotation.