[SPR-7326] Added unit tests to verify proper semantics of TestContext's cache key generation.

org.springframework.test/src/main/java/org/springframework/test/context/ContextLoaderUtils.java

@@ -18,9 +18,9 @@ package org.springframework.test.context;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -243,13 +243,16 @@ abstract class ContextLoaderUtils {
 				annotationType, clazz));
 		}
 
-		final Set<String> activeProfiles = new LinkedHashSet<String>();
+		// Active profiles must be sorted due to cache key generation in
+		// TestContext. Specifically, profile sets {foo,bar} and {bar,foo}
+		// must both result in the same array (e.g., [bar,foo]).
+		final SortedSet<String> activeProfiles = new TreeSet<String>();
 
 		while (declaringClass != null) {
 			ActiveProfiles annotation = declaringClass.getAnnotation(annotationType);
 
 			if (logger.isTraceEnabled()) {
-				logger.trace(String.format("Retrieved @ActiveProfiles [%s] for declaring class [%s].", activeProfiles,
+				logger.trace(String.format("Retrieved @ActiveProfiles [%s] for declaring class [%s].", annotation,
 					declaringClass));
 			}
 

org.springframework.test/src/main/java/org/springframework/test/context/TestContext.java

@@ -170,12 +170,24 @@ public class TestContext extends AttributeAccessorSupport {
 			if (context == null) {
 				try {
 					context = loadApplicationContext();
+					if (logger.isDebugEnabled()) {
+						logger.debug(String.format(
+							"Storing ApplicationContext for test class [%s] in cache under key [%s].", testClass,
+							contextKey));
+					}
 					contextCache.put(contextKey, context);
 				}
 				catch (Exception ex) {
 					throw new IllegalStateException("Failed to load ApplicationContext", ex);
 				}
 			}
+			else {
+				if (logger.isDebugEnabled()) {
+					logger.debug(String.format(
+						"Retrieved ApplicationContext for test class [%s] from cache with key [%s].", testClass,
+						contextKey));
+				}
+			}
 			return context;
 		}
 	}

org.springframework.test/src/test/java/org/springframework/test/context/SpringRunnerContextCacheTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -39,6 +39,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
  * @author Sam Brannen
  * @author Juergen Hoeller
  * @since 2.5
+ * @see TestContextCacheKeyTests
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration("/org/springframework/test/context/junit4/SpringJUnit4ClassRunnerAppCtxTests-context.xml")
@@ -50,18 +51,32 @@ public class SpringRunnerContextCacheTests {
 	protected ApplicationContext applicationContext;
 
 
+	/**
+	 * Asserts the statistics of the context cache in {@link TestContextManager}.
+	 * 
+	 * @param usageScenario the scenario in which the statistics are used
+	 * @param expectedSize the expected number of contexts in the cache
+	 * @param expectedHitCount the expected hit count
+	 * @param expectedMissCount the expected miss count
+	 */
+	private static final void assertContextCacheStatistics(String usageScenario, int expectedSize,
+			int expectedHitCount, int expectedMissCount) {
+		assertContextCacheStatistics(TestContextManager.contextCache, usageScenario, expectedSize, expectedHitCount,
+			expectedMissCount);
+	}
+
 	/**
 	 * Asserts the statistics of the supplied context cache.
 	 * 
+	 * @param contextCache the cache to assert against
 	 * @param usageScenario the scenario in which the statistics are used
 	 * @param expectedSize the expected number of contexts in the cache
 	 * @param expectedHitCount the expected hit count
 	 * @param expectedMissCount the expected miss count
 	 */
-	public static final void assertContextCacheStatistics(String usageScenario, int expectedSize, int expectedHitCount,
-			int expectedMissCount) {
+	public static final void assertContextCacheStatistics(ContextCache contextCache, String usageScenario,
+			int expectedSize, int expectedHitCount, int expectedMissCount) {
 
-		ContextCache contextCache = TestContextManager.contextCache;
 		assertEquals("Verifying number of contexts in cache (" + usageScenario + ").", expectedSize,
 			contextCache.size());
 		assertEquals("Verifying number of cache hits (" + usageScenario + ").", expectedHitCount,

org.springframework.test/src/test/java/org/springframework/test/context/TestContextCacheKeyTests.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2002-2011 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.test.context;
+
+import static org.junit.Assert.assertNotNull;
+import static org.springframework.test.context.SpringRunnerContextCacheTests.assertContextCacheStatistics;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+
+/**
+ * Unit tests for verifying proper behavior of the {@link ContextCache} in 
+ * conjunction with cache keys generated in {@link TestContext}.
+ * 
+ * @author Sam Brannen
+ * @since 3.1
+ * @see SpringRunnerContextCacheTests
+ */
+public class TestContextCacheKeyTests {
+
+	private ContextCache contextCache = new ContextCache();
+
+
+	@Before
+	public void initialCacheState() {
+		assertContextCacheStatistics(contextCache, "initial state", 0, 0, 0);
+	}
+
+	private void loadAppCtxAndAssertCacheStats(Class<?> testClass, int expectedSize, int expectedHitCount,
+			int expectedMissCount) {
+		TestContext testContext = new TestContext(testClass, contextCache);
+		ApplicationContext context = testContext.getApplicationContext();
+		assertNotNull(context);
+		assertContextCacheStatistics(contextCache, testClass.getName(), expectedSize, expectedHitCount,
+			expectedMissCount);
+	}
+
+	@Test
+	public void verifyCacheKeyIsBasedOnContextLoader() {
+		loadAppCtxAndAssertCacheStats(AnnotationConfigContextLoaderTestCase.class, 1, 0, 1);
+		loadAppCtxAndAssertCacheStats(AnnotationConfigContextLoaderTestCase.class, 1, 1, 1);
+		loadAppCtxAndAssertCacheStats(CustomAnnotationConfigContextLoaderTestCase.class, 2, 1, 2);
+		loadAppCtxAndAssertCacheStats(CustomAnnotationConfigContextLoaderTestCase.class, 2, 2, 2);
+		loadAppCtxAndAssertCacheStats(AnnotationConfigContextLoaderTestCase.class, 2, 3, 2);
+		loadAppCtxAndAssertCacheStats(CustomAnnotationConfigContextLoaderTestCase.class, 2, 4, 2);
+	}
+
+	@Test
+	public void verifyCacheKeyIsBasedOnActiveProfiles() {
+		loadAppCtxAndAssertCacheStats(FooBarProfilesTestCase.class, 1, 0, 1);
+		loadAppCtxAndAssertCacheStats(FooBarProfilesTestCase.class, 1, 1, 1);
+		// Profiles {foo, bar} should hash to the same as {bar,foo}
+		loadAppCtxAndAssertCacheStats(BarFooProfilesTestCase.class, 1, 2, 1);
+		loadAppCtxAndAssertCacheStats(FooBarProfilesTestCase.class, 1, 3, 1);
+		loadAppCtxAndAssertCacheStats(FooBarProfilesTestCase.class, 1, 4, 1);
+		loadAppCtxAndAssertCacheStats(BarFooProfilesTestCase.class, 1, 5, 1);
+	}
+
+
+	@Configuration
+	static class Config {
+	}
+
+	@ContextConfiguration(classes = Config.class, loader = AnnotationConfigContextLoader.class)
+	private static class AnnotationConfigContextLoaderTestCase {
+	}
+
+	@ContextConfiguration(classes = Config.class, loader = CustomAnnotationConfigContextLoader.class)
+	private static class CustomAnnotationConfigContextLoaderTestCase {
+	}
+
+	private static class CustomAnnotationConfigContextLoader extends AnnotationConfigContextLoader {
+	}
+
+	@ActiveProfiles({ "foo", "bar" })
+	@ContextConfiguration(classes = Config.class, loader = AnnotationConfigContextLoader.class)
+	private static class FooBarProfilesTestCase {
+	}
+
+	@ActiveProfiles({ "bar", "foo" })
+	@ContextConfiguration(classes = Config.class, loader = AnnotationConfigContextLoader.class)
+	private static class BarFooProfilesTestCase {
+	}
+
+}