Preserve registration order in @ActiveProfiles

With this commit, bean definition profiles declared via @ActiveProfiles
are once again stored in registration order, in order to support use
cases in Spring Boot and other frameworks that depend on the
registration order.

This effectively reverts the changes made in conjunction with gh-25973.

Closes gh-26004

spring-test/src/main/java/org/springframework/test/context/ActiveProfiles.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -79,7 +79,7 @@ public @interface ActiveProfiles {
 	 * <p>The default value is {@code true}, which means that a test
 	 * class will <em>inherit</em> bean definition profiles defined by a
 	 * test superclass. Specifically, the bean definition profiles for a test
-	 * class will be added to the list of bean definition profiles
+	 * class will be appended to the list of bean definition profiles
 	 * defined by a test superclass. Thus, subclasses have the option of
 	 * <em>extending</em> the list of bean definition profiles.
 	 * <p>If {@code inheritProfiles} is set to {@code false}, the bean

spring-test/src/main/java/org/springframework/test/context/MergedContextConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -19,8 +19,8 @@ package org.springframework.test.context;
 import java.io.Serializable;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.Set;
-import java.util.TreeSet;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextInitializer;
@@ -533,8 +533,8 @@ public class MergedContextConfiguration implements Serializable {
 			return EMPTY_STRING_ARRAY;
 		}
 
-		// Active profiles must be unique and sorted
-		Set<String> profilesSet = new TreeSet<>(Arrays.asList(activeProfiles));
+		// Active profiles must be unique
+		Set<String> profilesSet = new LinkedHashSet<>(Arrays.asList(activeProfiles));
 		return StringUtils.toStringArray(profilesSet);
 	}
 

spring-test/src/main/java/org/springframework/test/context/support/ActiveProfilesUtils.java

@@ -16,8 +16,11 @@
 
 package org.springframework.test.context.support;
 
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.List;
 import java.util.Set;
-import java.util.TreeSet;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -67,7 +70,7 @@ abstract class ActiveProfilesUtils {
 	static String[] resolveActiveProfiles(Class<?> testClass) {
 		Assert.notNull(testClass, "Class must not be null");
 
-		Set<String> activeProfiles = new TreeSet<>();
+		List<String[]> profileArrays = new ArrayList<>();
 
 		Class<ActiveProfiles> annotationType = ActiveProfiles.class;
 		AnnotationDescriptor<ActiveProfiles> descriptor =
@@ -106,17 +109,25 @@ abstract class ActiveProfilesUtils {
 
 			String[] profiles = resolver.resolve(rootDeclaringClass);
 			if (!ObjectUtils.isEmpty(profiles)) {
-				for (String profile : profiles) {
-					if (StringUtils.hasText(profile)) {
-						activeProfiles.add(profile.trim());
-					}
-				}
+				profileArrays.add(profiles);
 			}
 
 			descriptor = (annotation.inheritProfiles() ? MetaAnnotationUtils.findAnnotationDescriptor(
 					rootDeclaringClass.getSuperclass(), annotationType) : null);
 		}
 
+		// Reverse the list so that we can traverse "down" the hierarchy.
+		Collections.reverse(profileArrays);
+
+		Set<String> activeProfiles = new LinkedHashSet<>();
+		for (String[] profiles : profileArrays) {
+			for (String profile : profiles) {
+				if (StringUtils.hasText(profile)) {
+					activeProfiles.add(profile.trim());
+				}
+			}
+		}
+
 		return StringUtils.toStringArray(activeProfiles);
 	}
 

spring-test/src/main/java/org/springframework/test/context/support/DefaultActiveProfilesResolver.java

@@ -16,9 +16,6 @@
 
 package org.springframework.test.context.support;
 
-import java.util.Set;
-import java.util.TreeSet;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
@@ -26,7 +23,6 @@ import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.ActiveProfilesResolver;
 import org.springframework.test.util.MetaAnnotationUtils.AnnotationDescriptor;
 import org.springframework.util.Assert;
-import org.springframework.util.StringUtils;
 
 import static org.springframework.test.util.MetaAnnotationUtils.findAnnotationDescriptor;
 
@@ -43,6 +39,8 @@ import static org.springframework.test.util.MetaAnnotationUtils.findAnnotationDe
  */
 public class DefaultActiveProfilesResolver implements ActiveProfilesResolver {
 
+	private static final String[] EMPTY_STRING_ARRAY = new String[0];
+
 	private static final Log logger = LogFactory.getLog(DefaultActiveProfilesResolver.class);
 
 
@@ -58,36 +56,24 @@ public class DefaultActiveProfilesResolver implements ActiveProfilesResolver {
 	@Override
 	public String[] resolve(Class<?> testClass) {
 		Assert.notNull(testClass, "Class must not be null");
-
-		Set<String> activeProfiles = new TreeSet<>();
-
-		Class<ActiveProfiles> annotationType = ActiveProfiles.class;
-		AnnotationDescriptor<ActiveProfiles> descriptor = findAnnotationDescriptor(testClass, annotationType);
+		AnnotationDescriptor<ActiveProfiles> descriptor = findAnnotationDescriptor(testClass, ActiveProfiles.class);
 
 		if (descriptor == null) {
 			if (logger.isDebugEnabled()) {
 				logger.debug(String.format(
 					"Could not find an 'annotation declaring class' for annotation type [%s] and class [%s]",
-					annotationType.getName(), testClass.getName()));
+					ActiveProfiles.class.getName(), testClass.getName()));
 			}
+			return EMPTY_STRING_ARRAY;
 		}
 		else {
-			Class<?> declaringClass = descriptor.getDeclaringClass();
 			ActiveProfiles annotation = descriptor.synthesizeAnnotation();
-
 			if (logger.isTraceEnabled()) {
 				logger.trace(String.format("Retrieved @ActiveProfiles [%s] for declaring class [%s].", annotation,
-					declaringClass.getName()));
-			}
-
-			for (String profile : annotation.profiles()) {
-				if (StringUtils.hasText(profile)) {
-					activeProfiles.add(profile.trim());
-				}
+					descriptor.getDeclaringClass().getName()));
 			}
+			return annotation.profiles();
 		}
-
-		return StringUtils.toStringArray(activeProfiles);
 	}
 
 }

spring-test/src/test/java/org/springframework/test/context/MergedContextConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -143,7 +143,7 @@ class MergedContextConfigurationTests {
 				EMPTY_STRING_ARRAY, EMPTY_CLASS_ARRAY, activeProfiles1, loader);
 		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(),
 				EMPTY_STRING_ARRAY, EMPTY_CLASS_ARRAY, activeProfiles2, loader);
-		assertThat(mergedConfig2).hasSameHashCodeAs(mergedConfig1);
+		assertThat(mergedConfig2.hashCode()).isNotEqualTo(mergedConfig1.hashCode());
 	}
 
 	@Test
@@ -339,7 +339,7 @@ class MergedContextConfigurationTests {
 				EMPTY_STRING_ARRAY, EMPTY_CLASS_ARRAY, activeProfiles1, loader);
 		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(),
 				EMPTY_STRING_ARRAY, EMPTY_CLASS_ARRAY, activeProfiles2, loader);
-		assertThat(mergedConfig2).isEqualTo(mergedConfig1);
+		assertThat(mergedConfig2).isNotEqualTo(mergedConfig1);
 	}
 
 	@Test

spring-test/src/test/java/org/springframework/test/context/cache/ContextCacheTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -90,8 +90,8 @@ class ContextCacheTests {
 		int size = 0, hit = 0, miss = 0;
 		loadCtxAndAssertStats(FooBarProfilesTestCase.class, ++size, hit, ++miss);
 		loadCtxAndAssertStats(FooBarProfilesTestCase.class, size, ++hit, miss);
-		// Profiles {foo, bar} MUST hash to the same as {bar, foo}
-		loadCtxAndAssertStats(BarFooProfilesTestCase.class, size, ++hit, miss);
+		// Profiles {foo, bar} should not hash to the same as {bar,foo}
+		loadCtxAndAssertStats(BarFooProfilesTestCase.class, ++size, hit, ++miss);
 		loadCtxAndAssertStats(FooBarProfilesTestCase.class, size, ++hit, miss);
 		loadCtxAndAssertStats(FooBarProfilesTestCase.class, size, ++hit, miss);
 		loadCtxAndAssertStats(BarFooProfilesTestCase.class, size, ++hit, miss);

spring-test/src/test/java/org/springframework/test/context/support/ActiveProfilesUtilsTests.java

@@ -67,12 +67,12 @@ class ActiveProfilesUtilsTests extends AbstractContextConfigurationUtilsTests {
 
 	@Test
 	void resolveActiveProfilesWithDuplicatedProfiles() {
-		assertResolvedProfiles(DuplicatedProfiles.class, "bar", "baz", "foo");
+		assertResolvedProfiles(DuplicatedProfiles.class, "foo", "bar", "baz");
 	}
 
 	@Test
 	void resolveActiveProfilesWithLocalAndInheritedDuplicatedProfiles() {
-		assertResolvedProfiles(ExtendedDuplicatedProfiles.class, "bar", "baz", "cat", "dog", "foo");
+		assertResolvedProfiles(ExtendedDuplicatedProfiles.class, "foo", "bar", "baz", "cat", "dog");
 	}
 
 	@Test
@@ -92,12 +92,12 @@ class ActiveProfilesUtilsTests extends AbstractContextConfigurationUtilsTests {
 
 	@Test
 	void resolveActiveProfilesWithLocalAndInheritedAnnotations() {
-		assertResolvedProfiles(LocationsBar.class, "bar", "foo");
+		assertResolvedProfiles(LocationsBar.class, "foo", "bar");
 	}
 
 	@Test
 	void resolveActiveProfilesWithOverriddenAnnotation() {
-		assertResolvedProfiles(Animals.class, "cat", "dog");
+		assertResolvedProfiles(Animals.class, "dog", "cat");
 	}
 
 	/**
@@ -129,7 +129,7 @@ class ActiveProfilesUtilsTests extends AbstractContextConfigurationUtilsTests {
 	 */
 	@Test
 	void resolveActiveProfilesWithLocalAndInheritedMetaAnnotations() {
-		assertResolvedProfiles(MetaLocationsBar.class, "bar", "foo");
+		assertResolvedProfiles(MetaLocationsBar.class, "foo", "bar");
 	}
 
 	/**
@@ -137,7 +137,7 @@ class ActiveProfilesUtilsTests extends AbstractContextConfigurationUtilsTests {
 	 */
 	@Test
 	void resolveActiveProfilesWithOverriddenMetaAnnotation() {
-		assertResolvedProfiles(MetaAnimals.class, "cat", "dog");
+		assertResolvedProfiles(MetaAnimals.class, "dog", "cat");
 	}
 
 	/**
@@ -161,7 +161,7 @@ class ActiveProfilesUtilsTests extends AbstractContextConfigurationUtilsTests {
 	 */
 	@Test
 	void resolveActiveProfilesWithMergedInheritedResolver() {
-		assertResolvedProfiles(MergedInheritedFooActiveProfilesResolverTestCase.class, "bar", "foo");
+		assertResolvedProfiles(MergedInheritedFooActiveProfilesResolverTestCase.class, "foo", "bar");
 	}
 
 	/**