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Testing
To start: (this to new wiki page) https://developer.android.com/training/testing/start/index.html#config-instrumented-tests
– Plain old JUnit test case. It can be extended to test utility classes that are not tied to the Android framework.
– It extends JUnit’s TestCase. It’s a lighter testing class compared to ActivityTestCase. It doesn’t need to launch an activity to run it. Its getContext() method allows you to get an injected context if you need one. Since you can get a context from this class, you can inflate your UI objects to test their behaviors.
– It’s the newer version of ActivityInstrumentationTestCase. ActivityInstrumentationTestCase is deprecated in Android SDK 1.5. It’s a heavier testing class compared to AndroidTestCase. It provides UI and functional testing for a single activity. You can get an injected activity that you are testing on by calling its getActivity() method. The activity being tested is launched and finished before and after each test.
– It gives the tested activity an isolated environment. When using it to test an activity, the activity is not attached to the system. This gives you more control over what kind of environment that you want your activity to be tested in. ApplicationTestCase – It provides testing for Application classes. It can be used to test the life cycle of an application.
– The runner that runs the Android test cases.
A test case that has access to Instrumentation.
Extend this if you need to access Resources or other things that depend on Activity Context. AndroidTestCase is pretty well summarized via that link you posted. InstrumentationTestCase is higher up the class hierarchy from ActivityInstrumentationTestCase2. It's heavier weight than a plain AndroidTestCase, but it only exposes an Instrumentation object and no Activity, limiting its usefulness.
In reality, you'll probably never need this class, because it doesn't offer much (if any) performance advantage over ActivityInstrumentationTestCase2, which offers access to an Instrumentation object itself. In any case, if you want to know what you can do with an Instrumentation object, check out this or this.
by lmiceli