HomeActivityTestRule.java

private static class HomeActivityTestRule extends IntentsTestRule {
    private HomeActivityTestRule() {
        super(HomeActivity.class);
    }

    @Override public void beforeActivityLaunched() {
        Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
        ShowAndHideApplication app =
                (ShowAndHideApplication) instrumentation.getTargetContext().getApplicationContext();
        ShowAndHideTestComponent component = DaggerShowAndHideTestComponent.builder()
                .mockFileUtilitiesModule(new MockFileUtilitiesModule())
                .mockImageProcessorModule(new MockImageProcessorModule())
                .build();
        app.setComponent(component);
    }
}