0. Considerations

Considerations

• If you get stuck, Master branch contains already solved tests for SuperHeroesLoginActivity, SuperHeroesActivityTest and SuperHeroDetailActivity

• A DaggerMockRule is an utility to let you create Dagger 2 modules dynamically. In this case we are using it to create a new MainModule in this testing scope. Instead of returning real objects, this new MainModule will returns the mock for SuperHeroesRepository defined in this test.

• You will find some utilities to help you test RecyclerViews and Toolbars easily in: app/src/androidTest/java/com/karumi/katasuperheroes/matchers and app/src/androidTest/java/com/karumi/katasuperheroes/recyclerview.

  • RecyclerViewInteraction: provides an easy way to apply an Espresso matcher to all of the RecyclerView elements

    RecyclerViewInteraction.<ITEM_TYPE>onRecyclerView(withId(R.id.recycler_view))
    .withItems(A_LIST_OF_ITEMS)
    .check(new RecyclerViewInteraction.ItemViewAssertion<ITEM_TYPE>() {
        @Override
        public void check(ITEM_TYPE item, View view, NoMatchingViewException e) {
            matches(A_MATCHER).check(view, e);
        }
    });

  • RecyclerViewItemsCountMatcher: a matcher that returns true if RecyclerView contains the expected number of elements.

  • ToolbarMatcher: a matcher that returns true if a Toolbar with expected title is found.