Refine @TestPropertySource locations support

Update SpringApplicationContextLoader to configure test property
locations before the ApplicationContext is actually started.

Fixes gh-2198

spring-boot/src/main/java/org/springframework/boot/test/SpringApplicationContextLoader.java

@@ -76,7 +76,7 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 	private static final String LINE_SEPARATOR = System.getProperty("line.separator");
 
 	@Override
-	public ApplicationContext loadContext(MergedContextConfiguration config)
+	public ApplicationContext loadContext(final MergedContextConfiguration config)
 			throws Exception {
 		assertValidAnnotations(config.getTestClass());
 		SpringApplication application = getSpringApplication();
@@ -98,8 +98,6 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 		}
 		application.setInitializers(initializers);
 		ConfigurableApplicationContext applicationContext = application.run();
-		TestPropertySourceUtils.addPropertiesFilesToEnvironment(applicationContext,
-				config.getPropertySourceLocations());
 		return applicationContext;
 	}
 
@@ -116,7 +114,7 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 
 	/**
 	 * Builds new {@link org.springframework.boot.SpringApplication} instance. You can
-	 * override this method to add custom behaviour
+	 * override this method to add custom behavior
 	 * @return {@link org.springframework.boot.SpringApplication} instance
 	 */
 	protected SpringApplication getSpringApplication() {
@@ -196,6 +194,8 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 	private List<ApplicationContextInitializer<?>> getInitializers(
 			MergedContextConfiguration mergedConfig, SpringApplication application) {
 		List<ApplicationContextInitializer<?>> initializers = new ArrayList<ApplicationContextInitializer<?>>();
+		initializers.add(new PropertySourceLocationsInitializer(mergedConfig
+				.getPropertySourceLocations()));
 		initializers.add(new ServerPortInfoApplicationContextInitializer());
 		initializers.addAll(application.getInitializers());
 		for (Class<? extends ApplicationContextInitializer<?>> initializerClass : mergedConfig
@@ -273,4 +273,24 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 				.findAnnotation(testClass, WebIntegrationTest.class) != null));
 	}
 
+	/**
+	 * {@link ApplicationContextInitializer} to setup test property source locations.
+	 */
+	private static class PropertySourceLocationsInitializer implements
+			ApplicationContextInitializer<ConfigurableApplicationContext> {
+
+		private final String[] propertySourceLocations;
+
+		public PropertySourceLocationsInitializer(String[] propertySourceLocations) {
+			this.propertySourceLocations = propertySourceLocations;
+		}
+
+		@Override
+		public void initialize(ConfigurableApplicationContext applicationContext) {
+			TestPropertySourceUtils.addPropertiesFilesToEnvironment(applicationContext,
+					this.propertySourceLocations);
+		}
+
+	}
+
 }

spring-boot/src/test/java/org/springframework/boot/test/SpringApplicationIntegrationTestPropertyLocationTests.java

@@ -16,10 +16,15 @@
 
 package org.springframework.boot.test;
 
+import javax.annotation.PostConstruct;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.SpringApplicationIntegrationTestPropertyLocationTests.MoreConfig;
 import org.springframework.boot.test.SpringApplicationIntegrationTestTests.Config;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
 import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@@ -34,7 +39,7 @@ import static org.junit.Assert.assertThat;
  * @author Phillip Webb
  */
 @RunWith(SpringJUnit4ClassRunner.class)
-@SpringApplicationConfiguration(classes = Config.class)
+@SpringApplicationConfiguration(classes = { Config.class, MoreConfig.class })
 @WebAppConfiguration
 @IntegrationTest({ "server.port=0", "value1=123" })
 @TestPropertySource(properties = "value2=456", locations = "classpath:/test-property-source-annotation.properties")
@@ -51,4 +56,25 @@ public class SpringApplicationIntegrationTestPropertyLocationTests {
 				equalTo("fromfile"));
 	}
 
+	@Configuration
+	static class MoreConfig {
+
+		@Value("${value1}")
+		private String value1;
+
+		@Value("${value2}")
+		private String value2;
+
+		@Value("${annotation-referenced}")
+		private String annotationReferenced;
+
+		@PostConstruct
+		void checkValues() {
+			assertThat(this.value1, equalTo("123"));
+			assertThat(this.value2, equalTo("456"));
+			assertThat(this.annotationReferenced, equalTo("fromfile"));
+		}
+
+	}
+
 }