Android unit testing

For unit testing you can use the built in JUnit framework just like in "standard" java applications.

A unit test is to test some low-level part - usually a single class - of a project, working individually.

The only trick is to extend AndroidTestCase in your test case instead of TestCase some Android specific methods, like getContext() which is often required by android functions.

Lets see a very simple example using eclipse:

- Create a new project to test, create a new class in it, with a simple method that , like this:

- Create a new test project: File/new/Other.../Android/Android Test Project

Add the previously created project as the test target, the other fields can be left as they are auto filled.

- Add a test case to the test project, by left clicking on the package new/other../java/junit test case

Be sure tho change superclass to junit.framework.TestCase. For some reason eclipse does not fill out constuctor properly, so just uncheck it for now.

The automatically generated testcase will look like this:

The setUp() method runs once before all test methods, the tearDown() runs after all tests are runned.

Now add a testing method, and do some initialization in setUp():

Now if you run the test project as an android test project you will hopefully see this screen indicating that all tests passed: