Spring Framework Quality Control & Assurance 3 — Questions and Answers
Question 1: Which tool integrated with Spring Boot Actuator provides health checks that can be used for quality assurance in production?
- Spring Security
- Spring Actuator HealthIndicator (Correct answer)
- Spring Batch
- Spring Cloud Config
Correct answer: Spring Actuator HealthIndicator
Spring Boot Actuator's HealthIndicator interface allows components to report their health status via the /actuator/health endpoint.
Question 2: What is the role of Testcontainers when used with Spring Boot tests?
- Provides mock implementations of Spring beans
- Starts real Docker containers (e.g., databases) during integration tests (Correct answer)
- Generates test data automatically
- Replaces the embedded Tomcat with a containerized server
Correct answer: Starts real Docker containers (e.g., databases) during integration tests
Testcontainers starts and manages real Docker containers for services like PostgreSQL or Redis during integration test execution.
Question 3: In Spring, which annotation marks a method to run before each test method in a JUnit 5 test class?
- @Before
- @BeforeEach (Correct answer)
- @Setup
- @Init
Correct answer: @BeforeEach
JUnit 5 uses @BeforeEach (not JUnit 4's @Before) to annotate setup methods that run before each individual test.
Question 4: Which Spring framework feature allows you to verify that a method was called on a @MockBean a specific number of times?
- Verify API from Mockito via Mockito.verify() (Correct answer)
- Spring's @AssertCalled annotation
- JUnit's assertInvocations() method
- MockMvc's .andExpect(invocations(1))
Correct answer: Verify API from Mockito via Mockito.verify()
Mockito.verify() combined with times() allows assertions on how many times a method was called on a mock or spy bean.
Question 5: What does the @Transactional annotation do when applied to a Spring test method?
- Commits the transaction after each test to persist data
- Rolls back the transaction after each test by default (Correct answer)
- Disables transaction management for that test
- Starts a new distributed transaction across services
Correct answer: Rolls back the transaction after each test by default
When @Transactional is applied to a Spring test, the transaction is rolled back after each test method by default, keeping the database clean.
Question 6: Which Spring Boot Actuator metric can help QA teams detect slow database queries in production?
- spring.datasource.active
- spring.jpa.query.time
- spring.datasource.hikari.pending-threads (Correct answer)
- jdbc.connections.max
Correct answer: spring.datasource.hikari.pending-threads
The HikariCP metric for pending threads indicates connection pool exhaustion, which can signal slow queries blocking other requests.
Question 7: What is the purpose of the @ParameterizedTest annotation in JUnit 5 when writing Spring tests?
- Injects Spring beans as test method parameters
- Runs the same test method multiple times with different input values (Correct answer)
- Marks a test as requiring a parameterized Spring context
- Configures test parameters from application.properties
Correct answer: Runs the same test method multiple times with different input values
@ParameterizedTest enables running the same test with multiple data sets, improving coverage without duplicating test methods.
Spring Framework Quality Control & Assurance 3
Which tool integrated with Spring Boot Actuator provides health checks that can be used for quality assurance in production?