Fix @ActiveProfile to override existing profiles

Change SpringApplicationContextLoader to set active profiles using the
`spring.profiles.active` environment property rather than calling
`SpringApplication.setAdditionalProfiles`. This allows @ActiveProfiles
to replace existing profiles rather than add to them which is consistent
with the Spring TestContext Framework.

Fixes gh-1469

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

@@ -48,6 +48,7 @@ import org.springframework.test.context.support.AnnotationConfigContextLoaderUti
 import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.test.context.web.WebMergedContextConfiguration;
 import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 import org.springframework.web.context.support.GenericWebApplicationContext;
 import org.springframework.web.context.support.StandardServletEnvironment;
 
@@ -80,13 +81,16 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 			throws Exception {
 		SpringApplication application = getSpringApplication();
 		application.setSources(getSources(config));
-		if (!ObjectUtils.isEmpty(config.getActiveProfiles())) {
-			application.setAdditionalProfiles(config.getActiveProfiles());
-		}
 		ConfigurableEnvironment environment = new StandardEnvironment();
 		if (config instanceof WebMergedContextConfiguration) {
 			environment = new StandardServletEnvironment();
 		}
+		if (!ObjectUtils.isEmpty(config.getActiveProfiles())) {
+			String profiles = StringUtils.arrayToCommaDelimitedString(config
+					.getActiveProfiles());
+			EnvironmentTestUtils.addEnvironment(environment, "spring.profiles.active="
+					+ profiles);
+		}
 		// Ensure @IntegrationTest properties go before external config and after system
 		environment.getPropertySources()
 				.addAfter(

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

@@ -0,0 +1,55 @@
+/*
+ * 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.test;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link SpringApplicationContextLoader} with active profiles. See gh-1469.
+ *
+ * @author Phillip Webb
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration
+@IntegrationTest("spring.config.name=enableother")
+@ActiveProfiles("override")
+public class SpringApplicationConfigurationActiveProfileTests {
+
+	@Autowired
+	private ApplicationContext context;
+
+	@Test
+	public void profiles() throws Exception {
+		assertThat(this.context.getEnvironment().getActiveProfiles(),
+				equalTo(new String[] { "override" }));
+	}
+
+	@Configuration
+	protected static class Config {
+
+	}
+
+}