Add a new spring-boot-sample-test application

Add a sample application that demonstrates recently added testing
features.

See gh-4901

spring-boot-samples/spring-boot-sample-test/src/main/java/sample/test/WelcomeCommandLineRunner.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2012-2016 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 sample.test;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+/**
+ * Simple component that just prints a message. Used to show how different types of
+ * integration tests work.
+ *
+ * @author Phillip Webb
+ */
+@Component
+public class WelcomeCommandLineRunner implements CommandLineRunner {
+
+	@Override
+	public void run(String... args) throws Exception {
+		System.out.println("***** WELCOME TO THE DEMO *****");
+	}
+
+}