Consider WebAppConfiguration in @SpringBootTest

Update SpringBootTestContextBootstrapper to consider the
`@WebAppConfiguration` annotation and use sensible resourceBasePath
defaults.

Fixes gh-6371

spring-boot-samples/spring-boot-sample-war/pom.xml

@@ -43,6 +43,11 @@
 				</exclusion>
 			</exclusions>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>

spring-boot-samples/spring-boot-sample-war/src/main/java/sample/war/SampleWarApplication.java

@@ -19,11 +19,13 @@ package sample.war;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.support.SpringBootServletInitializer;
+import org.springframework.context.annotation.PropertySource;
 
 /**
  * Sample WAR application
  */
 @SpringBootApplication
+@PropertySource(value = { "WEB-INF/custom.properties" })
 public class SampleWarApplication extends SpringBootServletInitializer {
 
 	public static void main(String[] args) {

spring-boot-samples/spring-boot-sample-war/src/main/webapp/WEB-INF/custom.properties

@@ -0,0 +1 @@
+demo.string.value=demo

spring-boot-samples/spring-boot-sample-war/src/test/java/sample/war/WarApplicationResourceTests.java

@@ -0,0 +1,42 @@
+/*
+ * 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.war;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class WarApplicationResourceTests {
+
+	// gh-6371
+
+	@Value("${demo.string.value}")
+	private String demoStringValue;
+
+	@Test
+	public void contextLoads() {
+		assertThat(this.demoStringValue).isEqualTo("demo");
+	}
+
+}

spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootTestContextBootstrapper.java

@@ -33,6 +33,7 @@ import org.springframework.test.context.MergedContextConfiguration;
 import org.springframework.test.context.TestContext;
 import org.springframework.test.context.TestContextBootstrapper;
 import org.springframework.test.context.support.DefaultTestContextBootstrapper;
+import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.test.context.web.WebMergedContextConfiguration;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
@@ -122,7 +123,13 @@ public class SpringBootTestContextBootstrapper extends DefaultTestContextBootstr
 		if (webEnvironment != null) {
 			if (webEnvironment.isEmbedded() || (webEnvironment == WebEnvironment.MOCK
 					&& hasWebEnvironmentClasses())) {
-				mergedConfig = new WebMergedContextConfiguration(mergedConfig, "");
+				WebAppConfiguration webAppConfiguration = AnnotatedElementUtils
+						.findMergedAnnotation(mergedConfig.getTestClass(),
+								WebAppConfiguration.class);
+				String resourceBasePath = (webAppConfiguration == null ? "src/main/webapp"
+						: webAppConfiguration.value());
+				mergedConfig = new WebMergedContextConfiguration(mergedConfig,
+						resourceBasePath);
 			}
 		}
 		return mergedConfig;

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestWebEnvironmentMockTests.java

@@ -29,6 +29,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.context.request.RequestAttributes;
 import org.springframework.web.context.request.RequestContextHolder;
@@ -75,6 +76,12 @@ public class SpringBootTestWebEnvironmentMockTests {
 		assertThat(attributes).isNotNull();
 	}
 
+	@Test
+	public void resourcePath() throws Exception {
+		assertThat(ReflectionTestUtils.getField(this.servletContext, "resourceBasePath"))
+				.isEqualTo("src/main/webapp");
+	}
+
 	@Configuration
 	@EnableWebMvc
 	protected static class Config {

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestWebEnvironmentMockWithWebAppConfigurationTests.java

@@ -0,0 +1,69 @@
+/*
+ * 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.test.context;
+
+import javax.servlet.ServletContext;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringBootTest} configured with {@link WebEnvironment#MOCK}.
+ *
+ * @author Phillip Webb
+ * @author Andy Wilkinson
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@DirtiesContext
+@WebAppConfiguration("src/mymain/mywebapp")
+public class SpringBootTestWebEnvironmentMockWithWebAppConfigurationTests {
+
+	@Autowired
+	private ServletContext servletContext;
+
+	@Test
+	public void resourcePath() throws Exception {
+		assertThat(ReflectionTestUtils.getField(this.servletContext, "resourceBasePath"))
+				.isEqualTo("src/mymain/mywebapp");
+	}
+
+	@Configuration
+	@EnableWebMvc
+	protected static class Config {
+
+		@Bean
+		public static PropertySourcesPlaceholderConfigurer propertyPlaceholder() {
+			return new PropertySourcesPlaceholderConfigurer();
+		}
+
+	}
+
+}