Added test_switchCategoryVisibilityNotVisible() (inverted test_switchCategoryVisibility) | Edited test_getVisibleCategories() for better test coverage
Update MainActivityTest
Updated test_getCategoryByTitle for better test coverage | Updated MainActivityTest
Updated TaskManagerTest for better test coverage
Updated TaskListAdapterTest for better test coverage
Updated TaskListAdapterTest for better test coverage
Updated TaskListAdapterTest for better test coverage
Updated CategoryListAdapter for better test coverage
Fixed test failure in CategoryListAdapterTest
Updated CategoryActivityTest for better test coverage