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https://github.com/github/awesome-copilot.git
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e4fc57f204
- Introduced MockMvcTester for AssertJ-style assertions in Spring MVC testing. - Added @RestClientTest for testing REST clients with MockRestServiceServer. - Implemented RestTestClient as a modern alternative to TestRestTemplate. - Documented migration steps from Spring Boot 3.x to 4.0, including dependency and annotation changes. - Created an overview of test slices to guide testing strategies. - Included Testcontainers setup for JDBC testing with PostgreSQL and MySQL. - Enhanced @WebMvcTest documentation with examples for various HTTP methods and validation.
116 lines
2.4 KiB
Markdown
116 lines
2.4 KiB
Markdown
# Context Caching
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Optimize Spring Boot test suite performance through context caching.
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## How Context Caching Works
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Spring's TestContext Framework caches application contexts based on their configuration "key". Tests with identical configurations reuse the same context.
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### What Affects the Cache Key
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- @ContextConfiguration
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- @TestPropertySource
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- @ActiveProfiles
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- @WebAppConfiguration
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- @MockitoBean definitions
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- @TestConfiguration imports
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## Cache Key Examples
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### Same Key (Context Reused)
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```java
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@WebMvcTest(OrderController.class)
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class OrderControllerTest1 {
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@MockitoBean private OrderService orderService;
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}
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@WebMvcTest(OrderController.class)
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class OrderControllerTest2 {
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@MockitoBean private OrderService orderService;
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}
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// Same context reused
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```
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### Different Key (New Context)
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```java
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@WebMvcTest(OrderController.class)
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@ActiveProfiles("test")
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class OrderControllerTest1 { }
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@WebMvcTest(OrderController.class)
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@ActiveProfiles("integration")
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class OrderControllerTest2 { }
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// Different contexts loaded
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```
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## Viewing Cache Statistics
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### Spring Boot Actuator
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```yaml
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management:
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endpoints:
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web:
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exposure:
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include: metrics
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```
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Access: `GET /actuator/metrics/spring.test.context.cache`
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### Debug Logging
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```properties
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logging.level.org.springframework.test.context.cache=DEBUG
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```
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## Optimizing Cache Hit Rate
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### Group Tests by Configuration
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```
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tests/
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unit/ # No context
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web/ # @WebMvcTest
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repository/ # @DataJpaTest
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integration/ # @SpringBootTest
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```
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### Minimize @TestPropertySource Variations
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**Bad (multiple contexts):**
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```java
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@TestPropertySource(properties = "app.feature-x=true")
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class FeatureXTest { }
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@TestPropertySource(properties = "app.feature-y=true")
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class FeatureYTest { }
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```
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**Better (grouped):**
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```java
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@TestPropertySource(properties = {"app.feature-x=true", "app.feature-y=true"})
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class FeaturesTest { }
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```
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### Use @DirtiesContext Sparingly
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Only when context state truly changes:
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```java
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@Test
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@DirtiesContext // Forces context rebuild after test
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void testThatModifiesBeanDefinitions() { }
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```
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## Best Practices
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1. **Group by configuration** - Keep tests with same config together
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2. **Limit property variations** - Use profiles over individual properties
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3. **Avoid @DirtiesContext** - Prefer test data cleanup
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4. **Use narrow slices** - @WebMvcTest vs @SpringBootTest
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5. **Monitor cache hits** - Enable debug logging occasionally
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