Android JUnit4 Testing - Where to get Context from?

Question

I have to build an app with sqlite usage. Now I want to write my unit tests. These unit tests should test my class SQLiteBridge. SQLiteBridge provi

Answer 1

As described here: https://code.google.com/p/android-test-kit/wiki/AndroidJUnitRunnerUserGuide Use the InstrumentationRegistry to obtain the context.

However if you call InstrumentationRegistry.getContext() directly you may get an exception opening your database. I believe this is because the context returned by getContext() points to the instrumentation's context rather than that of your application / unit test. Instead use InstrumentationRegistry.getInstrumentation().getTargetContext()

For example:

@RunWith(AndroidJUnit4.class)
public class SqliteTest {

    Context mMockContext;

    @Before
    public void setUp() {
        mMockContext = new RenamingDelegatingContext(InstrumentationRegistry.getTargetContext(), "test_");
    }
}

The RenamingDelegatingContext simply prefixes the file/database names with test_ to prevent you from overwriting data that you may have in the same simulator.