Question

I want to preform a JUnit tests on my application. I’ve never done JUnit testing before so I have a couple of (maybe trivial) questions:

1. Where should I put a test class? I came across with this thread:
   Where should I put my JUnit tests?,
   and the guy that answers the question is referring to maven projects, but I don’t use maven. He explains (in the thread I linked above) that he puts the test class in a different location but in the same package. How can it be done in a GWT project?

2. How should I execute these tests once they are ready (where in the code to put the execution)?

Answer 1

You should begin by reviewing this: Unit Testing GWT Applications with JUnit.

1. The other thread is good and reflects the typical JUnit practice, and isn’t specific to maven: use a mirror of your package tree under a directory called test. So for instance if your GWT EntryPoint module is located in this directory structure:

   project/src/com/myproject/mypackage/MyEntryPoint.java
   

   Then your test code will be here:

   project/test/com/myproject/mypackage/MyEntryPointTests.java
   

   If you’ve created your GWT project using webAppCreator then you should already have a test directory containing the package structure as described.

2. If you use webAppCreator to create your project, the project can be created with unit testing built-in like so:

   webAppCreator -junit -out MyProject com.myproject.mypackage.MyEntryPoint
   

   This will create a test target. If you’re using Eclipse, then you should have a Run selection for: Run As -> GWT Unit Test for running your tests.

   If you’re using ant instead of Eclipse then this should run your unit tests:

   ant test
   

   If you didn’t use -junit to create the project, the test targets are typically still there, just commented out. Search junit in build.xml to find the targets, and un-comment them.