Allow directly present @BootstrapWith to override meta annotations

Prior to this commit, if a test class was meta-annotated with multiple
@BootstrapWith declarations that registered different
TestContextBootstrapper implementations, such a configuration would
result in an IllegalStateException, and there was no way to override
this behavior.

This commit addresses this shortcoming by relaxing the explicit
TestContextBootstrapper resolution in BootstrapUtils so that a directly
present @BootstrapWith annotation will now override declarations of
@BootstrapWith that are meta-present. In other words, if @BootstrapWith
is used as a meta-annotation, it can be overridden directly on the test
class via an explicit, local declaration of @BootstrapWith.

Issue: SPR-17006

spring-test/src/test/java/org/springframework/test/context/BootstrapUtilsTests.java

@@ -99,6 +99,14 @@ public class BootstrapUtilsTests {
 		assertBootstrapper(DuplicateMetaAnnotatedBootstrapWithAnnotationClass.class, FooBootstrapper.class);
 	}
 
+	/**
+	 * @since 5.1
+	 */
+	@Test
+	public void resolveTestContextBootstrapperWithLocalDeclarationThatOverridesMetaBootstrapWithAnnotations() {
+		assertBootstrapper(LocalDeclarationAndMetaAnnotatedBootstrapWithAnnotationClass.class, EnigmaBootstrapper.class);
+	}
+
 	private void assertBootstrapper(Class<?> testClass, Class<?> expectedBootstrapper) {
 		BootstrapContext bootstrapContext = BootstrapTestUtils.buildBootstrapContext(testClass, delegate);
 		TestContextBootstrapper bootstrapper = resolveTestContextBootstrapper(bootstrapContext);
@@ -112,6 +120,8 @@ public class BootstrapUtilsTests {
 
 	static class BarBootstrapper extends DefaultTestContextBootstrapper {}
 
+	static class EnigmaBootstrapper extends DefaultTestContextBootstrapper {}
+
 	@BootstrapWith(FooBootstrapper.class)
 	@Retention(RetentionPolicy.RUNTIME)
 	@interface BootWithFoo {}
@@ -146,7 +156,12 @@ public class BootstrapUtilsTests {
 	@BootWithFoo
 	@BootWithFooAgain
 	static class DuplicateMetaAnnotatedBootstrapWithAnnotationClass {}
-
+	
+	@BootWithFoo
+	@BootWithBar
+	@BootstrapWith(EnigmaBootstrapper.class)
+	static class LocalDeclarationAndMetaAnnotatedBootstrapWithAnnotationClass {}
+	
 	@WebAppConfiguration
 	static class WebAppConfigurationAnnotatedClass {}