Remove @⁠ContextConfiguration from MockitoBeanNestedTests

See gh-31456

spring-test/src/test/java/org/springframework/test/context/bean/override/mockito/MockitoBeanNestedTests.java

@@ -16,6 +16,7 @@
 
 package org.springframework.test.context.bean.override.mockito;
 
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -24,8 +25,10 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.TestContextAnnotationUtils;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.BDDMockito.then;
 import static org.mockito.Mockito.times;
 
@@ -38,10 +41,6 @@ import static org.mockito.Mockito.times;
  * @since 6.2
  */
 @ExtendWith(SpringExtension.class)
-// TODO Remove @ContextConfiguration declaration.
-// @ContextConfiguration is currently required due to a bug in the TestContext framework.
-// See https://github.com/spring-projects/spring-framework/issues/31456
-@ContextConfiguration
 class MockitoBeanNestedTests {
 
 	@MockitoBean
@@ -50,6 +49,13 @@ class MockitoBeanNestedTests {
 	@Autowired
 	Task task;
 
+	@BeforeAll
+	static void ensureNotAnnotatedWithContextConfiguration() {
+		boolean hasAnnotation =
+				TestContextAnnotationUtils.hasAnnotation(MockitoBeanNestedTests.class, ContextConfiguration.class);
+		assertThat(hasAnnotation).isFalse();
+	}
+
 	@Test
 	void mockWasInvokedOnce() {
 		task.execute();