quiz-game-part-02.md

Quiz Game - Part 02

Continue to work on the Maven project started as exercise in the first lesson.

Extend the 3 existing entity classes:

• Category: should have 0 or more subcategories
• SubCategory: should have a single parent category
• Quiz: should have a single subcategory it belongs to. Do NOT add a link back from subcategory to its quizzes

In the QuizEntityTest class, add the following tests:

• testQuizWithSubcategory: create one category with one subcategory. Then create a quiz for that subcategory. Verify that you can persist these 3 entities into the H2 database.

• testQueries: create 1 category (name JEE) with 3 subcategories (JPA, EJB and JSF). Then create 4 different quizzes: 2 in the same subcategory (JPA), and 1 each for the remaining 2 categories (EJB and JSF). Note: the actual content of the quizzes does not matter. In the test, create a TypedQuery in which, using JPQL, you retrieve all the quizzes belonging to the subcategory JPA. Verify you get only 2 quizzes. Create a second TypedQuery in which, using JPQL, you retrieve all the quizzes whose subcategory is under the JEE category. Verify you get all the 4 quizzes.

As you now have 3 different tests in QuizEntityTest, to avoid repeating writing the same code, make sure that the creation/shutdown of the EntityManager is done in @BeforeEach/@AfterEach methods.

Solutions to this exercise can be found in the intro/exercise-solutions/quiz-game/part-02 module.