By annotating test classes with @RunWith(SpringJUnit4ClassRunner.class) or the shorter @RunWith(SpringRunner.class) variant, developers can implement standard JUnit 4-based unit and integration tests and simultaneously reap the benefits of the TestContext framework, such as support for loading application contexts, dependency injection of test instances, transactional test method execution, and so on
@ExtendWith(SpringExtension.class) // Instructs Spring to load an ApplicationContext from TestConfig.class @ContextConfiguration(classes = TestConfig.class)
Constructor injection for test classes must not be used in conjunction with JUnit Jupiter’s @TestInstance(PER_CLASS) support if @DirtiesContext is used to close the test’s ApplicationContext before or after test methods. The reason is that @TestInstance(PER_CLASS) instructs JUnit Jupiter to cache the test instance between test method invocations. Consequently, the test instance will retain references to beans that were originally injected from an ApplicationContext that has been subsequently closed. Since the constructor for the test class will only be invoked once in such scenarios, dependency injection will not occur again, and subsequent tests will interact with beans from the closed ApplicationContext which may result in errors. To use @DirtiesContext with "before test method" or "after test method" modes in conjunction with @TestInstance(PER_CLASS), one must configure dependencies from Spring to be supplied via field or setter injection so that they can be re-injected between test method invocations
that has been subsequently closed
estNG Support Classes
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