Add more tests for @ComponentScan as a meta-annotation

Issue: SPR-11557

spring-context/src/test/java/org/springframework/context/annotation/ComponentScanAnnotationIntegrationTests.java

@@ -109,7 +109,7 @@ public class ComponentScanAnnotationIntegrationTests {
 	}
 
 	@Test
-	public void viaContextRegistration_WithComposedAnnotation() {
+	public void viaContextRegistration_WithLocallyDeclaredComposedAnnotation() {
 		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
 		ctx.register(ComposedAnnotationConfig.class);
 		ctx.refresh();
@@ -122,6 +122,19 @@ public class ComponentScanAnnotationIntegrationTests {
 			ctx.containsBean("simpleComponent"), is(true));
 	}
 
+	@Test
+	public void viaContextRegistration_WithExternallyDeclaredComposedAnnotation() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(org.springframework.context.annotation.componentscan.meta.ComposedAnnotationConfig.class);
+		ctx.refresh();
+		ctx.getBean(org.springframework.context.annotation.componentscan.meta.ComposedAnnotationConfig.class);
+		ctx.getBean(SimpleComponent.class);
+		assertThat("config class bean not found", ctx.containsBeanDefinition("composedAnnotationConfig"), is(true));
+		assertThat("@ComponentScan annotated @Configuration class registered directly against "
+				+ "AnnotationConfigApplicationContext did not trigger component scanning as expected",
+			ctx.containsBean("simpleComponent"), is(true));
+	}
+
 	@Test
 	public void viaBeanRegistration() {
 		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
@@ -236,10 +249,7 @@ public class ComponentScanAnnotationIntegrationTests {
 	@Retention(RetentionPolicy.RUNTIME)
 	@Target(ElementType.TYPE)
 	public static @interface ComposedConfiguration {
-
 		String[] basePackages() default {};
-
-		String[] bundles() default {};
 	}
 
 	@ComposedConfiguration(basePackages = "org.springframework.context.annotation.componentscan.simple")

spring-context/src/test/java/org/springframework/context/annotation/ConfigurationClassPostProcessorTests.java

@@ -111,8 +111,50 @@ public class ConfigurationClassPostProcessorTests {
 	}
 
 	@Test
-	public void postProcessorWorksWithComposedAnnotations() {
-		beanFactory.registerBeanDefinition("config", new RootBeanDefinition(ComposedAnnotationConfig.class));
+	public void postProcessorWorksWithLocallyDeclaredComposedConfiguration() {
+		beanFactory.registerBeanDefinition("config", new RootBeanDefinition(ComposedConfigurationClass.class));
+		ConfigurationClassPostProcessor pp = new ConfigurationClassPostProcessor();
+		pp.setEnvironment(new StandardEnvironment());
+		pp.postProcessBeanFactory(beanFactory);
+		SimpleComponent simpleComponent = beanFactory.getBean(SimpleComponent.class);
+		assertNotNull(simpleComponent);
+	}
+
+	@Test
+	public void postProcessorWorksWithLocallyDeclaredComposedComposedConfiguration() {
+		beanFactory.registerBeanDefinition("config", new RootBeanDefinition(ComposedComposedConfigurationClass.class));
+		ConfigurationClassPostProcessor pp = new ConfigurationClassPostProcessor();
+		pp.setEnvironment(new StandardEnvironment());
+		pp.postProcessBeanFactory(beanFactory);
+		SimpleComponent simpleComponent = beanFactory.getBean(SimpleComponent.class);
+		assertNotNull(simpleComponent);
+	}
+
+	@Test
+	public void postProcessorWorksWithLocallyDeclaredMetaComponentScanConfiguration() {
+		beanFactory.registerBeanDefinition("config", new RootBeanDefinition(MetaComponentScanConfigurationClass.class));
+		ConfigurationClassPostProcessor pp = new ConfigurationClassPostProcessor();
+		pp.setEnvironment(new StandardEnvironment());
+		pp.postProcessBeanFactory(beanFactory);
+		SimpleComponent simpleComponent = beanFactory.getBean(SimpleComponent.class);
+		assertNotNull(simpleComponent);
+	}
+
+	@Test
+	public void postProcessorWorksWithLocallyDeclaredMetaComponentScanConfigurationSubclass() {
+		beanFactory.registerBeanDefinition("config", new RootBeanDefinition(
+			SubMetaComponentScanConfigurationClass.class));
+		ConfigurationClassPostProcessor pp = new ConfigurationClassPostProcessor();
+		pp.setEnvironment(new StandardEnvironment());
+		pp.postProcessBeanFactory(beanFactory);
+		SimpleComponent simpleComponent = beanFactory.getBean(SimpleComponent.class);
+		assertNotNull(simpleComponent);
+	}
+
+	@Test
+	public void postProcessorWorksWithExternallyDeclaredComposedAnnotation() {
+		beanFactory.registerBeanDefinition("config", new RootBeanDefinition(
+			org.springframework.context.annotation.componentscan.meta.ComposedAnnotationConfig.class));
 		ConfigurationClassPostProcessor pp = new ConfigurationClassPostProcessor();
 		pp.setEnvironment(new StandardEnvironment());
 		pp.postProcessBeanFactory(beanFactory);
@@ -632,14 +674,44 @@ public class ConfigurationClassPostProcessorTests {
 	@Retention(RetentionPolicy.RUNTIME)
 	@Target(ElementType.TYPE)
 	public static @interface ComposedConfiguration {
+		String[] basePackages() default {};
+	}
+
+	@ComposedConfiguration(basePackages = "org.springframework.context.annotation.componentscan.simple")
+	public static class ComposedConfigurationClass {
+	}
 
+	@ComposedConfiguration
+	@Retention(RetentionPolicy.RUNTIME)
+	@Target(ElementType.TYPE)
+	public static @interface ComposedComposedConfiguration {
 		String[] basePackages() default {};
+	}
 
-		String[] bundles() default {};
+	@ComposedComposedConfiguration(basePackages = "org.springframework.context.annotation.componentscan.simple")
+	public static class ComposedComposedConfigurationClass {
 	}
 
-	@ComposedConfiguration(basePackages = "org.springframework.context.annotation.componentscan.simple")
-	public static class ComposedAnnotationConfig {
+	@ComponentScan
+	@Retention(RetentionPolicy.RUNTIME)
+	@Target(ElementType.TYPE)
+	public static @interface MetaComponentScan {
+	}
+
+	@MetaComponentScan
+	@Configuration
+	@Retention(RetentionPolicy.RUNTIME)
+	@Target(ElementType.TYPE)
+	public static @interface MetaComponentScanConfiguration {
+		String[] basePackages() default {};
+	}
+
+	@MetaComponentScanConfiguration(basePackages = "org.springframework.context.annotation.componentscan.simple")
+	public static class MetaComponentScanConfigurationClass {
+	}
+
+	@Configuration
+	public static class SubMetaComponentScanConfigurationClass extends MetaComponentScanConfigurationClass {
 	}
 
 }

spring-context/src/test/java/org/springframework/context/annotation/componentscan/meta/ComposedAnnotationConfig.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2002-2014 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
+ *
+ * http://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.annotation.componentscan.meta;
+
+/**
+ * @author Sam Brannen
+ * @since 4.0.3
+ */
+@ComposedConfiguration(basePackages = "org.springframework.context.annotation.componentscan.simple")
+public class ComposedAnnotationConfig {
+
+}

spring-context/src/test/java/org/springframework/context/annotation/componentscan/meta/ComposedConfiguration.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2002-2014 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
+ *
+ * http://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.annotation.componentscan.meta;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Composed annotation, combining {@link Configuration @Configuration} and
+ * {@link ComponentScan @ComponentScan}.
+ *
+ * @author Sam Brannen
+ * @since 4.0.3
+ */
+@Configuration
+@ComponentScan
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface ComposedConfiguration {
+	String[] basePackages() default {};
+}