Configuration from enclosing class not discovered for @Nested test class when enclosing class is not annotated with @ContextConfiguration #31456
Description
Overview
Given the following application and test classes, the @Nested test class fails due to getMessage() returning "Hello!" instead of "Mocked!" resulting from the fact that the static nested @TestConfiguration class is only discovered for the top-level enclosing test class.
Specifically, the MergedContextConfiguration for TestConfigurationNestedTests contains classes = [example.Application, example.TestConfigurationNestedTests.TestConfig]; whereas, the MergedContextConfiguration for InnerTests contains only classes = [example.Application].
A cursory search for @TestConfiguration reveals that SpringBootTestContextBootstrapper.containsNonTestComponent(...) uses the INHERITED_ANNOTATIONS search strategy for merged annotations. Instead, it should likely need to make use of TestContextAnnotationUtils in order to provide proper support for @NestedTestConfiguration semantics (perhaps analogous to the use of TestContextAnnotationUtils.searchEnclosingClass(...) in MockitoContextCustomizerFactory.parseDefinitions(...)).
As a side note, if you uncomment @Import(TestConfig.class) both test classes will pass.
package example; // imports... @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } @Service public static class GreetingService { public String getMessage() { return "Hello!"; } } }package example; // imports... @SpringBootTest // @Import(TestConfig.class) class TestConfigurationNestedTests { @Test void test(@Autowired GreetingService greetingService) { assertThat(greetingService.getMessage()).isEqualTo("Mocked!"); } @Nested class InnerTests { @Test void test(@Autowired GreetingService greetingService) { assertThat(greetingService.getMessage()).isEqualTo("Mocked!"); } } @TestConfiguration static class TestConfig { @MockBean GreetingService greetingService; @BeforeTestMethod void configureMock(BeforeTestMethodEvent event) { when(this.greetingService.getMessage()).thenReturn("Mocked!"); } } }