how to make an ActivityUnitTestCase that depends on a ContentProvider use test databases

MyActivityUnitTest.java

	@Override
	protected void setUp() throws Exception {
		super.setUp();

		// Create a Context for our content provider that will use the test.*
		// database instead of the production database
		final String filenamePrefix = "test.";
		final RenamingDelegatingContext testDatabaseContext = new RenamingDelegatingContext(
				getInstrumentation().getTargetContext(), getInstrumentation()
						.getTargetContext(), filenamePrefix);

		// Instantiate our content provider and make it use the Context created
		// above
		mProvider = new MyContentProvider();
		mProvider.attachInfo(testDatabaseContext, null);
		final boolean onCreate = mProvider.onCreate();
		assertTrue("ContentProvider reported failure in onCreate()", onCreate);

		// Create a mock ContentResolver that will give access to our content
		// provider and nothing else
		mResolver = new MockContentResolver();
		mResolver.addProvider(MyContentProvider.AUTHORITY, mProvider);

		// Create a Context for our activity under test that will use our
		// content resolver (and thus our content provider), and will otherwise
		// behave as the normal Context for an ActivityUnitTestCase
		mActivityContext = new ContextWrapper(getInstrumentation()
				.getTargetContext()) {
			@Override
			public ContentResolver getContentResolver() {
				return mResolver;
			}
		};

		setActivityContext(mActivityContext);
	}