test-suite-builder

Structure Kotlin Spring tests by applying a layered strategy using unit tests for domain logic, slice tests for framework boundaries, and full integration tests sparingly. This balances execution speed with realistic regression coverage while avoiding unnecessary application context startup.

Use slice tests instead of @SpringBootTest when verifying specific framework boundaries like HTTP contracts or persistence layers. Slice tests load only the necessary application context components, maximizing test speed and reliability compared to heavy integration tests that spin up the entire Spring context.

Test Spring coroutines using MockK and JUnit 5 by adhering to coroutine testing idioms and MockK mocking best practices. Enforce proper usage of Spring testing annotations to verify business logic accurately while maintaining framework boundaries within your layered test suite.

The best way to mock Kotlin dependencies in a Spring Boot test suite is using MockK alongside JUnit 5. It enforces Kotlin-specific mocking idioms and helps create maintainable tests that accurately reflect business logic without relying on brittle mocks or heavy integration setups.

Determine the minimal set of tests by categorizing verification into unit tests for domain logic and slice tests for security or persistence layers. This approach verifies the refactored complex service efficiently without unnecessarily spinning up the entire Spring application context.