Question 1

How to integrate Testcontainers with Spring Boot?

Accepted Answer

Use the Spring Boot Testcontainers module by adding dependencies and annotating tests with @Testcontainers. Define containers in @TestConfiguration and inject properties via @DynamicPropertySource for seamless database or service testing.

Question 2

Testcontainers vs in-memory H2: which is better for database testing?

Accepted Answer

Testcontainers is better for integration tests needing real database behavior, like specific SQL dialects or extensions, while H2 is faster for unit tests. Choose based on test scope and accuracy needs.

Question 3

What are ways to speed up Testcontainers tests?

Accepted Answer

Use container reuse modes for multiple tests, pre-pull Docker images, or optimize test suites to group similar dependencies. However, this may compromise isolation, so balance speed with reliability.

Question 4

Can Testcontainers test microservices with multiple dependencies?

Accepted Answer

Yes, it can spin up containers for services like Redis or Kafka, and integrate with Docker Compose for complex setups. This allows realistic end-to-end testing in isolated environments.

Question 5

How to handle database migrations in Testcontainers tests?

Accepted Answer

Run migration scripts (e.g., Flyway or Liquibase) during container startup using initialization scripts or custom Docker images. Ensure migrations are applied before tests execute to maintain state consistency.

Question 6

Is Testcontainers compatible with CI/CD pipelines?

Accepted Answer

Yes, but it requires Docker to be available in the CI environment, which may need additional configuration for permissions or resources. Use it to ensure consistent test runs across development and production-like setups.

Testcontainers

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