Make it easier to add auto-configuration to a test slice

Previously, an entry had to be added to spring.factories using the
name of one of the @AutoConfigure… meta-annotations on the @…Test
annotation as the key. This indirection was unnecessarily complicated.

This commit simplifies things by allowing the name of the @…Test
annotation itself to be used as the key.

Closes gh-6335

spring-boot-docs/src/main/groovy/generateTestSlicesTable.groovy

@@ -76,12 +76,21 @@ TestSlice createTestSlice(Properties springFactories, ClassMetadata classMetadat
 }
 
 Set<String> getImportedAutoConfiguration(Properties springFactories, ClassMetadata classMetadata, AnnotationMetadata annotationMetadata) {
+	Set<String> importers = findMetaImporters(annotationMetadata)
+	if (annotationMetadata.isAnnotated('org.springframework.boot.autoconfigure.ImportAutoConfiguration')) {
+		importers.add(annotationMetadata.className)
+	}
+	importers
+		.collect { autoConfigurationImporter ->
+			StringUtils.commaDelimitedListToSet(springFactories.get(autoConfigurationImporter))
+		}.flatten()
+}
+
+Set<String> findMetaImporters(AnnotationMetadata annotationMetadata) {
 	annotationMetadata.annotationTypes
 		.findAll { annotationType ->
 			isAutoConfigurationImporter(annotationType, annotationMetadata)
-		}.collect { autoConfigurationImporter ->
-			StringUtils.commaDelimitedListToSet(springFactories.get(autoConfigurationImporter))
-		}.flatten()
+		}
 }
 
 boolean isAutoConfigurationImporter(String annotationType, AnnotationMetadata metadata) {

spring-boot-samples/spring-boot-sample-devtools/src/main/java/sample/devtools/MyController.java

@@ -18,6 +18,7 @@ package sample.devtools;
 
 import java.util.Date;
 
+import javax.annotation.PostConstruct;
 import javax.servlet.http.HttpSession;
 
 import org.springframework.stereotype.Controller;
@@ -28,6 +29,11 @@ import org.springframework.web.servlet.ModelAndView;
 @Controller
 public class MyController {
 
+	@PostConstruct
+	public void slowRestart() throws InterruptedException {
+		Thread.sleep(5000);
+	}
+
 	@GetMapping("/")
 	public ModelAndView get(HttpSession session) {
 		Object sessionVar = session.getAttribute("var");

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/json/JsonTest.java

@@ -23,6 +23,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.test.autoconfigure.OverrideAutoConfiguration;
 import org.springframework.boot.test.autoconfigure.core.AutoConfigureCache;
@@ -62,6 +63,7 @@ import org.springframework.test.context.BootstrapWith;
 @AutoConfigureCache
 @AutoConfigureJson
 @AutoConfigureJsonTesters
+@ImportAutoConfiguration
 public @interface JsonTest {
 
 	/**

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/orm/jpa/DataJpaTest.java

@@ -23,6 +23,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.test.autoconfigure.OverrideAutoConfiguration;
 import org.springframework.boot.test.autoconfigure.core.AutoConfigureCache;
@@ -70,6 +71,7 @@ import org.springframework.transaction.annotation.Transactional;
 @AutoConfigureDataJpa
 @AutoConfigureTestDatabase
 @AutoConfigureTestEntityManager
+@ImportAutoConfiguration
 public @interface DataJpaTest {
 
 	/**

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/client/RestClientTest.java

@@ -23,6 +23,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.test.autoconfigure.OverrideAutoConfiguration;
 import org.springframework.boot.test.autoconfigure.core.AutoConfigureCache;
@@ -68,6 +69,7 @@ import org.springframework.web.client.RestTemplate;
 @AutoConfigureCache
 @AutoConfigureWebClient
 @AutoConfigureMockRestServiceServer
+@ImportAutoConfiguration
 public @interface RestClientTest {
 
 	/**

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/servlet/WebMvcTest.java

@@ -23,6 +23,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.test.autoconfigure.OverrideAutoConfiguration;
 import org.springframework.boot.test.autoconfigure.core.AutoConfigureCache;
@@ -75,6 +76,7 @@ import org.springframework.test.web.servlet.MockMvc;
 @AutoConfigureCache
 @AutoConfigureWebMvc
 @AutoConfigureMockMvc
+@ImportAutoConfiguration
 public @interface WebMvcTest {
 
 	/**