Can I make JUnit more verbose?

Question

I'd like to have it yell hooray whenever an assert statement succeeds, or at the very least have it display the number of successful assert statements that were encountered.

I'm using JUnit4.

Any suggestions?

Answer 1

If you want to see some output for each successful assertion, another simple approach which requires no external dependencies or source code, would be to define your own Assert class which delegates all methods to the standard JUnit Assert class, as well as logging successful assertions (failed assertions will be reported as usual by the JUnit class).

You then run a global search-and-replace on your test classes from "org.junit.Assert" => "com.myco.test.Assert", which should fix-up all regular and static import statements.

You could also then easily migrate your approach to the quieter-is-better-camp and change the wrapper class to just report the total # of passed assertions per test or per class, etc.

Answer 2

Adding some info that would have been helpful to me when I wanted JUnit to be more verbose and stumbled on this question. Maybe it will help other testers in the future.

If you are running JUnit from Ant, and want to see what tests are being run, you can add the following to your task:

<junit showoutput="true" printsummary="on" enabletestlistenerevents="true" fork="@{fork}" forkmode="once" haltonfailure="no" timeout="1800000"> 

Note that showoutput, printsummary, and enabletestlistenerevents are what helped, not the other task attributes. If you set these, you'll get output like:

Running com.foo.bar.MyTest junit.framework.TestListener: tests to run: 2 junit.framework.TestListener: startTest(myTestOne) junit.framework.TestListener: endTest(myTestOne) junit.framework.TestListener: startTest(myTestTwo) junit.framework.TestListener: endTest(myTestTwo) Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.495 sec 

This was useful to me when my tests were timing out and I wasn't sure which tests were actually taking too long, and which tests got cancelled because they were unlucky enough to be running when the time was up.