Refactor the Actuator MVC configuration to allow more customization

There is a new spring.factories entry for
org.springframework.boot.actuate.autoconfigure.EndpointWebMvcConfiguration
which loads extra beans into the MVC config for the Actuator.
If the management context is a child context all the beans go in the
child (except the Spring Security filter still). A big bonus is that
you can add WebConfigurerAdapters to configure static resources etc.
A new component called ManagementContextResolver can be used to
locate the ApplicationContext for the MVC endpoints.

Fixes gh-3345

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/WelcomePageMockMvcTests.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2012-2014 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.autoconfigure.web;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.After;
+import org.junit.Test;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.context.ConfigurableWebApplicationContext;
+
+/**
+ * Tests for welcome page using {@link MockMvc} and {@link SpringJUnit4ClassRunner}.
+ *
+ * @author Dave Syer
+ */
+public class WelcomePageMockMvcTests {
+
+	private ConfigurableWebApplicationContext wac;
+
+	private MockMvc mockMvc;
+
+	@After
+	public void close() {
+		if (wac != null) {
+			wac.close();
+		}
+	}
+
+	@Test
+	public void homePageNotFound() throws Exception {
+		wac = (ConfigurableWebApplicationContext) new SpringApplicationBuilder(
+				TestConfiguration.class).run();
+		this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
+		this.mockMvc.perform(get("/")).andExpect(status().isNotFound()).andReturn();
+	}
+
+	@Test
+	public void homePageCustomLocation() throws Exception {
+		wac = (ConfigurableWebApplicationContext) new SpringApplicationBuilder(
+				TestConfiguration.class).properties(
+				"spring.resources.staticLocations:classpath:/custom/").run();
+		this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
+		this.mockMvc.perform(get("/")).andExpect(status().isOk()).andReturn();
+	}
+
+	@Test
+	public void homePageCustomLocationNoTrailingSlash() throws Exception {
+		wac = (ConfigurableWebApplicationContext) new SpringApplicationBuilder(
+				TestConfiguration.class).properties("spring.resources.staticLocations:classpath:/custom").run();
+		this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
+		this.mockMvc.perform(get("/")).andExpect(status().isOk()).andReturn();
+	}
+
+	@Target(ElementType.TYPE)
+	@Retention(RetentionPolicy.RUNTIME)
+	@Documented
+	@Import({ EmbeddedServletContainerAutoConfiguration.EmbeddedTomcat.class,
+			EmbeddedServletContainerAutoConfiguration.class,
+			ServerPropertiesAutoConfiguration.class,
+			DispatcherServletAutoConfiguration.class, WebMvcAutoConfiguration.class,
+			HttpMessageConvertersAutoConfiguration.class,
+			ErrorMvcAutoConfiguration.class, PropertyPlaceholderAutoConfiguration.class })
+	protected static @interface MinimalWebConfiguration {
+	}
+
+	@Configuration
+	@MinimalWebConfiguration
+	public static class TestConfiguration {
+
+		// For manual testing
+		public static void main(String[] args) {
+			SpringApplication.run(TestConfiguration.class, args);
+		}
+
+	}
+
+}

spring-boot-autoconfigure/src/test/resources/custom/index.html

@@ -0,0 +1 @@
+<html><body>Hello!</body></html>