๐โ๐ ๐๐๐๐๐๐๐ธ๐ฅ๐ก๐๐๐ ๐๐๐ ๐๐๐๐๐๐๐ก๐๐ก๐๐ ๐กโ๐ ๐ ๐๐๐๐กโ ๐๐๐ก๐๐๐๐๐ก๐๐๐ ๐๐ ๐ฝ๐๐๐๐ก ๐ฝ๐ข๐๐๐ก๐๐ ๐ก๐๐ ๐ก๐ ๐ค๐๐กโ ๐๐๐๐๐๐'๐ ๐๐๐ ๐ก๐ถ๐๐๐ก๐๐ฅ๐ก ๐๐๐๐๐๐ค๐๐๐.
๐ผ๐ ๐๐๐ ๐ก ๐๐๐ ๐๐ , ๐กโ๐๐๐ ๐๐ ๐๐ ๐๐๐๐ ๐ก๐ ๐๐๐๐ข๐๐๐๐ฆ ๐๐๐๐๐ ๐ก๐๐ ๐กโ๐ ๐๐๐๐๐๐๐ธ๐ฅ๐ก๐๐๐ ๐๐๐ ๐ ๐๐๐๐ ๐๐๐ ๐๐๐๐๐๐ ๐ต๐๐๐ก ๐ก๐๐ ๐ก ๐ ๐๐๐๐ ๐๐๐๐๐ก๐๐ก๐๐๐๐ ๐๐ข๐ก๐๐๐๐ก๐๐๐๐๐๐ฆ โ๐๐๐๐๐ ๐กโ๐๐ ๐๐๐๐๐๐ ๐ .
๐ ฐ๏ธ What is the purpose of a JUnit Jupiter Extension?
The JUnit Jupiter extension model is a unified concept that enhances testing ๐งช functionality and allows for programmatic interception of test lifecycles.
It is a replacement ๐๏ธ for JUnit 4's Runner and Rule API.
Typically, extensions are implemented to address cross-cutting concerns that apply to multiple tests.
Numerous frameworks and testing libraries provide their own custom JUnit Jupiter extensions, such as
* ๐ธ MockitoExtension for streamlined mock setup,
* ๐ณ TestcontainersExtension (used with @Testcontainers) for managing Docker containers, and
* ๐ SpringExtension for seamless integration with Spring.
๐ ฑ๏ธ What is the purpose of the SpringExtension?
The SpringExtension serves several cross-cutting functionalities, as evidenced by its implementation in the source code.
It implements various interfaces๐คน , including BeforeAllCallback, AfterAllCallback, TestInstancePostProcessor, BeforeEachCallback, AfterEachCallback, BeforeTestExecutionCallback, AfterTestExecutionCallback, and ParameterResolver.
Its main responsibilities are as follows:
1. Managing the lifecycle ๐ of the Spring TestContext:
The SpringExtension ensures proper initialization, setup, and teardown of the Spring TestContext for test execution.
2. Supporting dependency injection ๐ for parameters:
It facilitates the injection of dependencies into test methods or constructors by resolving the required parameters.
3. Performing cleanup and housekeeping ๐งน tasks after the test:
The SpringExtension handles necessary cleanup ๐งผ operations, ensuring that resources are properly released and any necessary cleanup tasks are performed.
The SpringExtension acts as a bridge ๐ between JUnit Jupiter and the Spring Test framework.
In most cases, it delegates its responsibilities to the TestContextManager, which takes care of managing a single 1๏ธโฃ TestContext.
โบ๏ธ When is it necessary to register the SpringExtension?
In most scenarios, explicit registration of the SpringExtension is not โ required as it is already activated ๐ by default.
This activation occurs whenever we utilize a Spring Boot test annotation such as @WebMvcTest, @DataJpaTest, @JdbcTest, @DataMongoTest, @JsonTest, @RestClientTest, or @SpringBootTest.
However, there are certain limited situations where manual registration of the SpringExtension becomes necessary.
One example is when we create a custom test slice annotation, in which case we would need to explicitly register the SpringExtension to ensure its functionality is applied.
๐โ๐ ๐๐๐๐๐๐๐ธ๐ฅ๐ก๐๐๐ ๐๐๐ ๐๐๐๐๐๐๐๐๐ก๐ ๐ฃ๐๐๐๐๐ข๐ ๐๐๐๐๐๐๐๐ ๐๐๐กโ๐๐๐ ๐๐ ๐กโ๐ ๐ฝ๐๐๐๐ก ๐ฝ๐ข๐๐๐ก๐๐ ๐๐ฅ๐ก๐๐๐ ๐๐๐ ๐๐๐๐๐, ๐๐๐๐๐๐๐๐ ๐ ๐๐๐๐กโ ๐๐๐ก๐๐๐๐๐ก๐๐๐ ๐๐๐ก๐ค๐๐๐ ๐ฝ๐๐๐๐ก ๐๐๐ ๐๐๐๐๐๐.
๐ผ๐ ๐กโ๐ ๐๐๐๐ก๐๐ฅ๐ก ๐๐ ๐ก๐๐ ๐ก๐๐๐ ๐๐๐๐๐๐ ๐ต๐๐๐ก ๐๐๐๐๐๐๐๐ก๐๐๐๐ , ๐กโ๐๐๐ ๐๐ ๐ข๐ ๐ข๐๐๐๐ฆ ๐๐ ๐๐๐๐ ๐ก๐ ๐๐๐๐ข๐๐๐๐ฆ ๐๐๐๐๐ ๐ก๐๐ ๐กโ๐๐ ๐๐ฅ๐ก๐๐๐ ๐๐๐ ๐๐๐๐๐ข๐ ๐ ๐๐ก ๐๐ ๐๐ข๐ก๐๐๐๐ก๐๐๐๐๐๐ฆ โ๐๐๐๐๐๐ ๐๐ฆ ๐กโ๐ ๐ ๐๐๐๐๐ ๐๐๐๐ก๐๐ฅ๐ก ๐๐๐๐๐ก๐๐ก๐๐๐๐ ๐ ๐ข๐โ ๐๐ @๐๐๐๐๐ฃ๐๐๐๐ ๐ก.
๐ผ๐ ๐ฆ๐๐ข ๐ค๐๐ โ ๐ก๐ ๐๐ฅ๐๐๐๐๐ ๐กโ๐๐ ๐ก๐๐๐๐ ๐๐ข๐๐กโ๐๐, ๐๐๐๐๐๐๐๐๐ ๐ก๐ ๐กโ๐ ๐๐๐๐๐๐๐๐ ๐๐๐๐ข๐๐๐๐ก๐๐ก๐๐๐ ๐๐ โ๐๐โ๐๐ฆ ๐๐๐๐๐๐๐๐๐๐๐ ๐๐ ๐๐ก ๐๐๐๐ฃ๐๐๐๐ ๐๐๐๐๐๐โ๐๐๐ ๐๐ฃ๐ ๐๐๐๐๐๐๐๐ก๐๐๐ ๐๐ ๐กโ๐ ๐ ๐ข๐๐๐๐๐ก.