Rockhopper Blog

The Selenium website seems to be biased towards TestNG. That’s fine but I’m using JUnit4.

One nice feature of the selenium testcase class is to produce a screendump for failures. But it’s a JUnit 3 class; it seems they have not noticed that JUnit4 exists.

So how to get a screendump with a JUnit4 test case? Wrapping and delegation works but I wanted to do it directly.

In JUnit4 you can install a Listener that is notified at test execution checkpoints. Since I care about only failures I defined it like this:

public class MyRunListener extends RunListener {
   @Override
   public void testFailure(Failure failure) throws Exception
   { }
}

To make JUnit4 use your listener you need to install it with a Runner. Here is a simple one that gets the job done.

public class MyRunner extends JUnit4ClassRunner {
   private MyRunListener myRunListener;

   public MyRunner(Class<?> c) throws InitializationError {
      super(c);
      myRunListener = new MyRunListener();
   }

   @Override
   public void run(RunNotifier rn) {
      rn.addListener(myRunListener);
      super.run(rn);
   }
}

Then in the superclass of my tests I use the RunWith annotation and specify my runner. Since I want to do the selenium setup only once per class I use the JUnit4 BeforeClass and AfterClass annotations. In production I’d probably start the server externally though. Or if I use Selenium userextensions.

@RunWith(MyRunner.class)
public class MyBaseTest {
   protected static Selenium selenium;
   private static SeleniumServer seleniumServer;
   private static boolean startSeleniumServer = false;

@BeforeClass
public static void startUp() {
   if (startSeleniumServer) {
      try {
         SeleniumServer.setReusingBrowserSessions(true);
         seleniumServer = new SeleniumServer();
         seleniumServer.start();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
   selenium = new DefaultSelenium(serverHost, serverPort,
   browserStartCommand, browserURL);
   selenium.start();
   selenium.setBrowserLogLevel(SeleniumLogLevels.INFO);
}

@AfterClass
public static void cleanUp() {
   if (startSeleniumServer)
      seleniumServer.stop();
   selenium.stop();
}

etc.

Finally in my listeners testFailure method I get the Selenium instance from the base test class.

Selenium selenium = MyBaseTest.getSelenium();

It works!

In a future post, let’s see if I can use Spring for dependency injection of that selenium instance.

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