springboot-tdd

Test-driven development in Spring Boot involves writing failing tests first, implementing minimal code to pass, and refactoring. This workflow uses JUnit 5, Mockito, MockMvc, and Testcontainers to guide unit, web, and integration testing, ensuring high coverage and reliable builds.

The best way to structure Spring Boot integration tests is using Testcontainers for deterministic environments and applying Arrange-Act-Assert patterns. This approach keeps tests fast and maintainable by isolating dependencies and using data builders for consistent test data setup.

Yes, JUnit 5 and Mockito are required to start applying TDD in Spring Boot. These frameworks provide the foundational testing capabilities, along with MockMvc for web layers and Testcontainers for integration tests, to execute the structured failing-test-first workflow effectively.

MockMvc works with Spring Boot unit testing by simulating HTTP requests to test web layers without deploying a full server. It allows developers to write failing tests first for controllers, implement minimal endpoint code, and refactor until all web tests pass deterministically.

Yes, you can use this TDD workflow for refactoring existing Spring Boot services. The structured approach of writing failing tests, implementing minimal code, and refactoring applies directly to new features, bug fixes, and improving existing service reliability and coverage.

Spring Boot integration tests are often slow and brittle without Testcontainers because they lack isolated, deterministic environments. Using Testcontainers with structured Arrange-Act-Assert patterns ensures fast, maintainable tests by managing external dependencies reliably during execution.