Test the ApplicationContextAotGenerator with the agent

This commit adds new tests for the `ApplicationContextAotGenerator`,
this time leveraging the `RuntimeHintsAgent` that checks the need for
runtime hints at runtime.

See gh-27981

spring-context/spring-context.gradle

@@ -1,3 +1,7 @@
+plugins {
+	id 'org.springframework.build.runtimehints-agent'
+}
+
 description = "Spring Context"
 
 apply plugin: "kotlin"

spring-context/src/test/java/org/springframework/context/generator/ApplicationContextAotGeneratorRuntimeHintsTests.java

@@ -0,0 +1,129 @@
+/*
+ * Copyright 2002-2022 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.context.generator;
+
+import java.util.function.BiConsumer;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.aot.generate.DefaultGenerationContext;
+import org.springframework.aot.generate.InMemoryGeneratedFiles;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
+import org.springframework.aot.test.agent.EnabledIfRuntimeHintsAgent;
+import org.springframework.aot.test.agent.RuntimeHintsInvocations;
+import org.springframework.aot.test.agent.RuntimeHintsRecorder;
+import org.springframework.aot.test.generator.compile.TestCompiler;
+import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionBuilder;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.annotation.AnnotationConfigUtils;
+import org.springframework.context.annotation.CommonAnnotationBeanPostProcessor;
+import org.springframework.context.aot.ApplicationContextAotGenerator;
+import org.springframework.context.support.GenericApplicationContext;
+import org.springframework.context.testfixture.context.generator.SimpleComponent;
+import org.springframework.context.testfixture.context.generator.annotation.AutowiredComponent;
+import org.springframework.context.testfixture.context.generator.annotation.InitDestroyComponent;
+import org.springframework.core.testfixture.aot.generate.TestGenerationContext;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests the {@link org.springframework.aot.hint.RuntimeHints} generation in {@link ApplicationContextAotGenerator}.
+ *
+ * @author Brian Clozel
+ * @author Stephane Nicoll
+ */
+@EnabledIfRuntimeHintsAgent
+class ApplicationContextAotGeneratorRuntimeHintsTests {
+
+	@Test
+	void generateApplicationContextWithSimpleBean() {
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.registerBeanDefinition("test", new RootBeanDefinition(SimpleComponent.class));
+		compile(context, (hints, invocations) -> assertThat(invocations).match(hints));
+	}
+
+	@Test
+	void generateApplicationContextWithAutowiring() {
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.registerBeanDefinition(AnnotationConfigUtils.AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME,
+				BeanDefinitionBuilder.rootBeanDefinition(AutowiredAnnotationBeanPostProcessor.class)
+						.setRole(BeanDefinition.ROLE_INFRASTRUCTURE).getBeanDefinition());
+		context.registerBeanDefinition("autowiredComponent", new RootBeanDefinition(AutowiredComponent.class));
+		context.registerBeanDefinition("number", BeanDefinitionBuilder.rootBeanDefinition(Integer.class, "valueOf")
+				.addConstructorArgValue("42").getBeanDefinition());
+		compile(context, (hints, invocations) -> assertThat(invocations).match(hints));
+	}
+
+	@Test
+	void generateApplicationContextWithInitDestroyMethods() {
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.registerBeanDefinition(AnnotationConfigUtils.COMMON_ANNOTATION_PROCESSOR_BEAN_NAME,
+				BeanDefinitionBuilder.rootBeanDefinition(CommonAnnotationBeanPostProcessor.class)
+						.setRole(BeanDefinition.ROLE_INFRASTRUCTURE).getBeanDefinition());
+		context.registerBeanDefinition("initDestroyComponent", new RootBeanDefinition(InitDestroyComponent.class));
+		compile(context, (hints, invocations) -> assertThat(invocations).withRegistrar(new InitDestroyIssueRegistrar()).match(hints));
+	}
+
+	@Test
+	void generateApplicationContextWithMultipleInitDestroyMethods() {
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.registerBeanDefinition(AnnotationConfigUtils.COMMON_ANNOTATION_PROCESSOR_BEAN_NAME,
+				BeanDefinitionBuilder.rootBeanDefinition(CommonAnnotationBeanPostProcessor.class)
+						.setRole(BeanDefinition.ROLE_INFRASTRUCTURE).getBeanDefinition());
+		RootBeanDefinition beanDefinition = new RootBeanDefinition(InitDestroyComponent.class);
+		beanDefinition.setInitMethodName("customInit");
+		beanDefinition.setDestroyMethodName("customDestroy");
+		context.registerBeanDefinition("initDestroyComponent", beanDefinition);
+		compile(context, (hints, invocations) -> assertThat(invocations).withRegistrar(new InitDestroyIssueRegistrar()).match(hints));
+	}
+
+	// TODO: Remove once https://github.com/spring-projects/spring-framework/issues/28215 is fixed
+	static class InitDestroyIssueRegistrar implements RuntimeHintsRegistrar {
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			hints.reflection()
+					.registerType(TypeReference.of(InitDestroyComponent.class.getName()), typeHint ->
+							typeHint.withMembers(MemberCategory.INTROSPECT_PUBLIC_METHODS));
+		}
+	}
+
+	@SuppressWarnings({"rawtypes", "unchecked"})
+	private void compile(GenericApplicationContext applicationContext, BiConsumer<RuntimeHints, RuntimeHintsInvocations> initializationResult) {
+		ApplicationContextAotGenerator generator = new ApplicationContextAotGenerator();
+		InMemoryGeneratedFiles generatedFiles = new InMemoryGeneratedFiles();
+		DefaultGenerationContext generationContext = new TestGenerationContext(generatedFiles);
+		generator.generateApplicationContext(applicationContext, generationContext);
+		generationContext.writeGeneratedContent();
+		TestCompiler.forSystem().withFiles(generatedFiles).compile(compiled -> {
+			ApplicationContextInitializer instance = compiled.getInstance(ApplicationContextInitializer.class);
+			GenericApplicationContext freshContext = new GenericApplicationContext();
+			RuntimeHintsInvocations recordedInvocations = RuntimeHintsRecorder.record(() -> {
+				instance.initialize(freshContext);
+				freshContext.refresh();
+				freshContext.close();
+			});
+			initializationResult.accept(generationContext.getRuntimeHints(), recordedInvocations);
+		});
+	}
+
+}