TDD with Java and SpringBoot

Post-Test of TDD with Java and SpringBoot

1. In the TDD Life Cycle (Red-Green-Refactor), what is the primary goal of the 'Green' phase ?

• A. To write the most elegant and optimized code possible
• B. To write just enough code to make the failing test pass
• C. To identify and fix bugs in the production environment
• D. To design the database schema

2. Following the 'GUT' (Good Unit Test) structure, what happens during the 'Assert' stage ?

• A. The database connection is closed
• B. The actual result is compared against the expected outcome
• C. The method under test is executed.
• D. The test environment is initialized

3. According to the FIRST principles of testing, what does 'Self-Validating' mean ?

• A. The test should run automatically on a schedule
• B. The developer must manually check the logs to see if the test passed
• C. The test code should be able to fix the production code automatically
• D. The test should have a clear pass/fail output without human interpretation

4. What is the main difference between a 'Stub' and a 'Mock' in Test Doubles ?

• A. Mocks are always faster than Stubs
• B. Stubs provide canned answers; Mocks verify that specific calls were made (behavior verification)
• C. Stubs verify behavior; Mocks provide state
• D. Stubs are used in Spring Boot; Mocks are used in Vanilla Java

5. In Spring Boot, what is the role of Dependency Injection (DI) ?

• A. It allows a class to receive its dependencies from an external source (the Spring Container)
• B. It is a tool used exclusively for connecting to SQL databases
• C. It prevents the use of interfaces
• D. It manually creates every object using the 'new' keyword

6. When testing the Controller layer, what does '@WebMvcTest' provide ?

• A. A full server start-up with a real database connection
• B. A slice of the Spring Context focusing only on MVC components (Controllers, Filters, etc.)
• C. Automatic generation of documentation for the API
• D. A way to test the Repository layer directly

7. Why is the Service Layer considered the 'Business Process' layer ?

• A. Because it handles HTTP status codes
• B. Because it writes raw SQL queries
• C. Because it contains the core logic, rules, and transaction management of the application
• D. Because it is the only layer that uses the @Bean annotation

8. In the Repository Layer, what does '@DataJpaTest' automatically do to transactions after a test method finishes ?

• A. Rolls back the transaction
• B. Sends an email notification of the test result
• C. Commits the changes to the database permanently
• D. Deletes the entire database schema

9. What is the benefit of using 'Data-Driven Tests' (@ParameterizedTest) in JUnit ?

• A. It is required for every Spring Boot project
• B. It allows running the same test logic with different inputs and expected outputs to reduce code duplication
• C. It automatically fixes syntax errors in the production code
• D. It makes the test code 10 times faster

10. Which Test Double is an 'actual implementation' that is simplified (e.g., an In-Memory Database) ?

• A. Mock
• B. Spy
• C. Dummy
• D. Fake