Add spring-test annotations to auto imports

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/autoconfigure/SpringTestCompilerAutoConfiguration.java

@@ -66,6 +66,7 @@ public class SpringTestCompilerAutoConfiguration extends
 		imports.addStarImports("org.junit.runner")
 				.addStarImports("org.springframework.boot.test")
 				.addStarImports("org.springframework.test.context.junit4")
+				.addStarImports("org.springframework.test.annotation")
 				.addImports(
 						"org.springframework.test.context.web.WebAppConfiguration");
 	}

spring-boot-cli/test-samples/integration_auto.groovy

 @SpringApplicationConfiguration(classes=Application)
 @IntegrationTest('server.port:0')
 @WebAppConfiguration
+@DirtiesContext
 class RestTests {
 
 	@Value('${local.server.port}')