Update SpringApplicationBuilder example in the docs and test it

Closes gh-6488

spring-boot-docs/src/main/java/org/springframework/boot/builder/SpringApplicationBuilderExample.java

@@ -0,0 +1,54 @@
+/*
+ * 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 org.springframework.boot.builder;
+
+import org.springframework.boot.Banner;
+
+/**
+ * Examples of using {@link SpringApplicationBuilder}.
+ *
+ * @author Andy Wilkinson
+ */
+public class SpringApplicationBuilderExample {
+
+	public void hierarchyWithDisabledBanner(String[] args) {
+		// @formatter:off
+		// tag::hierarchy[]
+		new SpringApplicationBuilder()
+				.sources(Parent.class)
+				.child(Application.class)
+				.bannerMode(Banner.Mode.OFF)
+				.run(args);
+		// end::hierarchy[]
+		// @formatter:on
+	}
+
+	/**
+	 * Parent application configuration.
+	 */
+	static class Parent {
+
+	}
+
+	/**
+	 * Application configuration.
+	 */
+	static class Application {
+
+	}
+
+}