quiz-game-part-03.md

Quiz Game - Part 03

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

In the pom.xml file, add the following dependencies:

• org.hibernate:hibernate-validator
• org.glassfish.web:javax.el

Extend the 3 existing entity classes by adding constraints to them:

• Category: name should be unique, non-blank, and with a maximum size.
• SubCategory: name should be non-blank, and with a maximum size. Link to parent should not be null.
• Quiz: the question and the 4 answers cannot be blank, and should have a maximum size. Furthermore, the question must be unique. The index of the correct answer must be in range 0 to 3 (inclusive). Link to subcategory cannot be null.

After adding these constraints, you should see that testQuiz will fail now, as it does not set the subcategory. Modify the assertions in that test to verify that indeed it is not possible to save such entity.

Create a test class CategoryEntityTest with the following tests:

• testTooLongName: create a category with a too long name. Verify that it is not possible to persist it into the database. Then, verify that, if you use a short name, you can persist it.

• testUniqueName: create a category and verify you can persist it into the database. Create a new category with exactly same name. Verify you cannot persist this newly created entity.

In the test folder, create an abstract class named EntityTestBase. Both QuizEntityTest and CategoryEntityTest should extend such class. Move all the shared code (e.g., the @BeforeEach/@AfterEach database handling methods) into such abstract class. Note: it is important that such class name does not end with Test, otherwise it would be executed as test by Maven.

Solutions to this exercise can be found in the intro/exercise-solutions/quiz-game/part-03 module.