Update SpringApplicationBuilder example in the docs and test it

Closes gh-6488

spring-boot-docs/pom.xml

@@ -730,6 +730,13 @@
 			<artifactId>jedis</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<!-- Test dependencies -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot</artifactId>
+			<type>test-jar</type>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -149,11 +149,7 @@ For example:
 
 [source,java,indent=0]
 ----
-	new SpringApplicationBuilder()
+include::{code-examples}/builder/SpringApplicationBuilderExample.java[tag=hierarchy]
-		.bannerMode(Banner.Mode.OFF)
-		.sources(Parent.class)
-		.child(Application.class)
-		.run(args);
 ----
 
 NOTE: There are some restrictions when creating an `ApplicationContext` hierarchy, e.g.

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 {
+
+	}
+
+}

spring-boot-docs/src/test/java/org/springframework/boot/builder/SpringApplicationBuilderExampleTests.java

@@ -0,0 +1,47 @@
+/*
+ * 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.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.test.rule.OutputCapture;
+import org.springframework.boot.testutil.ClassPathExclusions;
+import org.springframework.boot.testutil.FilteredClassPathRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringApplicationBuilderExample}.
+ *
+ * @author Andy Wilkinson
+ */
+@RunWith(FilteredClassPathRunner.class)
+@ClassPathExclusions("spring-web-*.jar")
+public class SpringApplicationBuilderExampleTests {
+
+	@Rule
+	public OutputCapture outputCapture = new OutputCapture();
+
+	@Test
+	public void contextHierarchyWithDisabledBanner() {
+		new SpringApplicationBuilderExample().hierarchyWithDisabledBanner(new String[0]);
+		assertThat(this.outputCapture.toString()).doesNotContain(":: Spring Boot ::");
+	}
+
+}