Test MockReset strategy for @⁠MockitoSpyBean

As a follow up to commit 0088b9c, this commit introduces an
integration test which verifies that a spy created via @⁠MockitoSpyBean
using the MockReset.AFTER strategy is not reset between the refresh of
the ApplicationContext and the first use of the spy within a @⁠Test
method.

See gh-33941
See gh-33986

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

@@ -17,6 +17,7 @@
 package org.springframework.test.context.bean.override.mockito.integration;
 
 import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
 
 import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.context.event.EventListener;
@@ -25,6 +26,7 @@
 import org.springframework.test.context.bean.override.mockito.integration.MockitoBeanUsedDuringApplicationContextRefreshIntegrationTests.ContextRefreshedEventListener;
 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.then;
 
@@ -35,6 +37,7 @@
  * @author Sam Brannen
  * @author Yanming Zhou
  * @since 6.2.1
+ * @see MockitoSpyBeanUsedDuringApplicationContextRefreshIntegrationTests
  */
 @SpringJUnitConfig(ContextRefreshedEventListener.class)
 class MockitoBeanUsedDuringApplicationContextRefreshIntegrationTests {
@@ -45,6 +48,8 @@ class MockitoBeanUsedDuringApplicationContextRefreshIntegrationTests {
 
 	@Test
 	void test() {
+		assertThat(Mockito.mockingDetails(eventProcessor).isMock()).as("isMock").isTrue();
+		assertThat(Mockito.mockingDetails(eventProcessor).isSpy()).as("isSpy").isFalse();
 		// Ensure that the mock was invoked during ApplicationContext refresh
 		// and has not been reset in the interim.
 		then(eventProcessor).should().process(any(ContextRefreshedEvent.class));

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

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.test.context.bean.override.mockito.integration;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+import org.springframework.test.context.bean.override.mockito.MockitoSpyBean;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.same;
+import static org.mockito.BDDMockito.then;
+
+/**
+ * Integration tests for {@link MockitoSpyBean @MockitoSpyBean} used during
+ * {@code ApplicationContext} refresh.
+ *
+ * @author Sam Brannen
+ * @since 6.2.1
+ * @see MockitoBeanUsedDuringApplicationContextRefreshIntegrationTests
+ */
+@SpringJUnitConfig
+class MockitoSpyBeanUsedDuringApplicationContextRefreshIntegrationTests {
+
+	static ContextRefreshedEvent contextRefreshedEvent;
+
+	@MockitoSpyBean
+	ContextRefreshedEventProcessor eventProcessor;
+
+
+	@AfterAll
+	static void clearStaticField() {
+		contextRefreshedEvent = null;
+	}
+
+	@Test
+	void test() {
+		assertThat(Mockito.mockingDetails(eventProcessor).isSpy()).as("isSpy").isTrue();
+		// Ensure that the spy was invoked during ApplicationContext refresh
+		// and has not been reset in the interim.
+		then(eventProcessor).should().process(same(contextRefreshedEvent));
+	}
+
+
+	@Configuration
+	@Import(ContextRefreshedEventListener.class)
+	static class Config {
+
+		@Bean
+		ContextRefreshedEventProcessor eventProcessor() {
+			// Cannot be a lambda expression, since Mockito cannot create a spy for a lambda.
+			return new ContextRefreshedEventProcessor() {
+
+				@Override
+				public void process(ContextRefreshedEvent event) {
+					contextRefreshedEvent = event;
+				}
+			};
+		}
+	}
+
+	interface ContextRefreshedEventProcessor {
+		void process(ContextRefreshedEvent event);
+	}
+
+	// MUST be annotated with @Component, due to EventListenerMethodProcessor.isSpringContainerClass().
+	@Component
+	record ContextRefreshedEventListener(ContextRefreshedEventProcessor contextRefreshedEventProcessor) {
+
+		@EventListener
+		void onApplicationEvent(ContextRefreshedEvent event) {
+			this.contextRefreshedEventProcessor.process(event);
+		}
+	}
+
+}