Provide a condition for detecting war deployments

Closes gh-19421

spring-boot-tests/spring-boot-deployment-tests/src/main/java/sample/app/DeploymentTestApplication.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package sample;
+package sample.app;
 
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

spring-boot-tests/spring-boot-deployment-tests/src/main/java/sample/app/SampleController.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package sample;
+package sample.app;
 
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;

spring-boot-tests/spring-boot-deployment-tests/src/main/java/sample/autoconfig/ExampleAutoConfiguration.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2020 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 sample.autoconfig;
+
+import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
+import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWarDeployment;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@ConditionalOnWarDeployment
+@Configuration
+public class ExampleAutoConfiguration {
+
+	@Bean
+	public TestEndpoint testEndpoint() {
+		return new TestEndpoint();
+	}
+
+	@Endpoint(id = "war")
+	static class TestEndpoint {
+
+		@ReadOperation
+		String hello() {
+			return "{\"hello\":\"world\"}";
+		}
+
+	}
+
+}