Fix spring.profiles.active value handling

Previously, `spring.profiles.active` did not trim the individual comma
separate values. As a result, such profile wasn't enabled as expected.

This commit makes sure to trim whitespaces.

Closes gh-5442

spring-boot/src/main/java/org/springframework/boot/context/config/ConfigFileApplicationListener.java

@@ -95,6 +95,7 @@ import org.springframework.validation.BindException;
  * @author Phillip Webb
  * @author Stephane Nicoll
  * @author Andy Wilkinson
+ * @author Eddú Meléndez
  */
 public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 		ApplicationListener<ApplicationEvent>, Ordered {
@@ -582,8 +583,8 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 
 		private Set<String> asResolvedSet(String value, String fallback) {
 			List<String> list = Arrays
-					.asList(StringUtils.commaDelimitedListToStringArray(value != null
-							? this.environment.resolvePlaceholders(value) : fallback));
+					.asList(StringUtils.trimArrayElements(StringUtils.commaDelimitedListToStringArray(value != null
+							? this.environment.resolvePlaceholders(value) : fallback)));
 			Collections.reverse(list);
 			return new LinkedHashSet<String>(list);
 		}

spring-boot/src/test/java/org/springframework/boot/context/config/ConfigFileApplicationListenerTests.java

@@ -73,6 +73,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Phillip Webb
  * @author Dave Syer
+ * @author Eddú Meléndez
  */
 public class ConfigFileApplicationListenerTests {
 
@@ -529,6 +530,39 @@ public class ConfigFileApplicationListenerTests {
 				"applicationConfig: [classpath:/testsetprofiles.yml]");
 	}
 
+	@Test
+	public void yamlSetsMultiProfiles() throws Exception {
+		this.initializer.setSearchNames("testsetmultiprofiles");
+		this.initializer.postProcessEnvironment(this.environment, this.application);
+		assertThat(this.environment.getActiveProfiles()).containsExactly("dev", "healthcheck");
+		String property = this.environment.getProperty("my.property");
+		String property2 = this.environment.getProperty("my.property2");
+		assertThat(property).isEqualTo("fromdevprofile");
+		assertThat(property2).isEqualTo("fromhealthcheckprofile");
+		ConfigurationPropertySources propertySource = (ConfigurationPropertySources) this.environment
+				.getPropertySources()
+				.get(ConfigFileApplicationListener.APPLICATION_CONFIGURATION_PROPERTY_SOURCE_NAME);
+		Collection<org.springframework.core.env.PropertySource<?>> sources = propertySource
+				.getSource();
+		assertThat(sources).hasSize(3);
+		List<String> names = new ArrayList<String>();
+		for (org.springframework.core.env.PropertySource<?> source : sources) {
+			if (source instanceof EnumerableCompositePropertySource) {
+				for (org.springframework.core.env.PropertySource<?> nested : ((EnumerableCompositePropertySource) source)
+						.getSource()) {
+					names.add(nested.getName());
+				}
+			}
+			else {
+				names.add(source.getName());
+			}
+		}
+		assertThat(names).contains(
+				"applicationConfig: [classpath:/testsetmultiprofiles.yml]#healthcheck",
+				"applicationConfig: [classpath:/testsetmultiprofiles.yml]#dev",
+				"applicationConfig: [classpath:/testsetmultiprofiles.yml]");
+	}
+
 	@Test
 	public void yamlProfileCanBeChanged() throws Exception {
 		TestPropertySourceUtils.addInlinedPropertiesToEnvironment(this.environment,

spring-boot/src/test/resources/testsetmultiprofiles.yml

+---
+spring:
+  profiles:
+    active: dev, healthcheck
+my:
+  property: fromyamlfile
+  property2: fromyamlfile
+---
+spring:
+  profiles: dev
+my:
+  property: fromdevprofile
+---
+spring:
+  profiles: healthcheck
+my:
+  property2: fromhealthcheckprofile
\ No newline at end of file