Mock object classes

To facilitate dependency injection in testing, Android provides classes that create mock system objects

Simple mock object classes

MockApplication, MockContext, MockContentProvider, MockCursor, MockDialogInterface, MockPackageManager, and MockResources provide a simple and useful mock strategy. They are stubbed-out versions of the corresponding system object class, and all of their methods throw an UnsupportedOperationException exception if called. To use them, you override the methods you need in order to provide mock dependencies.

Note: MockContentProvider and MockCursor are new as of API level 8.

Resolver mock objects

MockContentResolver provides isolated testing of content providers by masking out the normal system resolver framework. Instead of looking in the system to find a content provider given an authority string, MockContentResolver uses its own internal table. You must explicitly add providers to this table using addProvider(String, ContentProvider).

With this feature, you can associate a mock content provider with an authority. You can create an instance of a real provider but use test data in it. You can even set the provider for an authority to null. In effect, a MockContentResolver object isolates your test from providers that contain real data. You can control the function of the provider, and you can prevent your test from affecting real data.