unit-test-caching

# Unit Testing Spring Caching ## Overview This skill provides patterns for unit testing Spring caching annotations (`@Cacheable`, `@CacheEvict`, `@CachePut`) without full Spring context. It covers cache hits/misses, invalidation, key generation, and conditional caching using in-memory `ConcurrentMapCacheManager`. ## When to Use - Writing unit tests for `@Cacheable` method behavior - Verifying `@CacheEvict` cache invalidation works correctly - Testing `@CachePut` cache updates - Validating cache key generation from SpEL expressions - Testing conditional caching with `unless`/`condition` parameters - Mocking cache managers in fast unit tests without Redis ## Instructions 1. **Configure in-memory CacheManager**: Use `ConcurrentMapCacheManager` for tests 2. **Set up test fixtures**: Mock repository and create service instance in `@BeforeEach` 3. **Verify repository call counts**: Use `times(n)` assertions to confirm cache behavior 4. **Test cache hit**: Call method twice, verify repository called once 5. **Test cache miss**: Verify repository called on each invocation 6. **Test eviction**: After `@CacheEvict`, verify repository called again on next read 7. **Test key generation**: Verify compound keys from SpEL expressions 8. **Validate conditional caching**: Test `unless` (null results) and `condition` (parameter-based) **Validation checkpoints:** - Run test → If cache not working: verify `@EnableCaching` annotation present - If proxy issues: ensure method calls go throug...