[SPR-8549] ContextCache is now keyed by MergedContextConfiguration instead of...

[SPR-8549] ContextCache is now keyed by MergedContextConfiguration instead of String; MergedContextConfiguration now implements custom hashCode() and equals() methods and no longer generates a context cache key.

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

 /*
- * Copyright 2002-2008 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.
@@ -16,7 +16,6 @@
 
 package org.springframework.test.context;
 
-import java.io.Serializable;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -29,8 +28,8 @@ import org.springframework.util.Assert;
  * Cache for Spring {@link ApplicationContext ApplicationContexts}
  * in a test environment.
  *
- * <p>Maintains a cache of {@link ApplicationContext contexts} by
- * {@link Serializable serializable} key. This has significant performance
+ * <p>Maintains a cache of {@link ApplicationContext contexts} keyed by
+ * {@link MergedContextConfiguration} instances. This has significant performance
  * benefits if initializing the context would take time. While initializing a
  * Spring context itself is very quick, some beans in a context, such as a
  * {@link org.springframework.orm.hibernate3.LocalSessionFactoryBean LocalSessionFactoryBean}
@@ -46,7 +45,7 @@ class ContextCache {
 	/**
 	 * Map of context keys to Spring ApplicationContext instances.
 	 */
-	private final Map<String, ApplicationContext> contextKeyToContextMap = new ConcurrentHashMap<String, ApplicationContext>();
+	private final Map<MergedContextConfiguration, ApplicationContext> contextMap = new ConcurrentHashMap<MergedContextConfiguration, ApplicationContext>();
 
 	private int hitCount;
 
@@ -57,7 +56,7 @@ class ContextCache {
 	 * Clears all contexts from the cache.
 	 */
 	void clear() {
-		this.contextKeyToContextMap.clear();
+		this.contextMap.clear();
 	}
 
 	/**
@@ -73,9 +72,9 @@ class ContextCache {
 	 * Return whether there is a cached context for the given key.
 	 * @param key the context key (never <code>null</code>)
 	 */
-	boolean contains(String key) {
+	boolean contains(MergedContextConfiguration key) {
 		Assert.notNull(key, "Key must not be null");
-		return this.contextKeyToContextMap.containsKey(key);
+		return this.contextMap.containsKey(key);
 	}
 
 	/**
@@ -87,9 +86,9 @@ class ContextCache {
 	 * or <code>null</code> if not found in the cache.
 	 * @see #remove
 	 */
-	ApplicationContext get(String key) {
+	ApplicationContext get(MergedContextConfiguration key) {
 		Assert.notNull(key, "Key must not be null");
-		ApplicationContext context = this.contextKeyToContextMap.get(key);
+		ApplicationContext context = this.contextMap.get(key);
 		if (context == null) {
 			incrementMissCount();
 		}
@@ -137,10 +136,10 @@ class ContextCache {
 	 * @param key the context key (never <code>null</code>)
 	 * @param context the ApplicationContext instance (never <code>null</code>)
 	 */
-	void put(String key, ApplicationContext context) {
+	void put(MergedContextConfiguration key, ApplicationContext context) {
 		Assert.notNull(key, "Key must not be null");
 		Assert.notNull(context, "ApplicationContext must not be null");
-		this.contextKeyToContextMap.put(key, context);
+		this.contextMap.put(key, context);
 	}
 
 	/**
@@ -150,8 +149,8 @@ class ContextCache {
 	 * or <code>null</code> if not found in the cache.
 	 * @see #setDirty
 	 */
-	ApplicationContext remove(String key) {
-		return this.contextKeyToContextMap.remove(key);
+	ApplicationContext remove(MergedContextConfiguration key) {
+		return this.contextMap.remove(key);
 	}
 
 	/**
@@ -165,7 +164,7 @@ class ContextCache {
 	 * @param key the context key (never <code>null</code>)
 	 * @see #remove
 	 */
-	void setDirty(String key) {
+	void setDirty(MergedContextConfiguration key) {
 		Assert.notNull(key, "Key must not be null");
 		ApplicationContext context = remove(key);
 		if (context instanceof ConfigurableApplicationContext) {
@@ -179,7 +178,7 @@ class ContextCache {
 	 * <tt>Integer.MAX_VALUE</tt>.
 	 */
 	int size() {
-		return this.contextKeyToContextMap.size();
+		return this.contextMap.size();
 	}
 
 	/**

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

@@ -16,6 +16,7 @@
 
 package org.springframework.test.context;
 
+import java.io.Serializable;
 import java.util.Arrays;
 import java.util.SortedSet;
 import java.util.TreeSet;
@@ -25,7 +26,7 @@ import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
 /**
- * <code>MergedContextConfiguration</code> encapsulates the <em>merged</em>
+ * {@code MergedContextConfiguration} encapsulates the <em>merged</em>
  * context configuration declared on a test class and all of its superclasses
  * via {@link ContextConfiguration @ContextConfiguration} and
  * {@link ActiveProfiles @ActiveProfiles}.
@@ -37,9 +38,14 @@ import org.springframework.util.StringUtils;
  * {@link ActiveProfiles#inheritProfiles inheritProfiles} flags in
  * {@code @ContextConfiguration} and {@code @ActiveProfiles}, respectively.
  * 
- * <p>A {@link SmartContextLoader} uses <code>MergedContextConfiguration</code>
+ * <p>A {@link SmartContextLoader} uses {@code MergedContextConfiguration}
  * to load an {@link org.springframework.context.ApplicationContext ApplicationContext}.
  * 
+ * <p>{@code MergedContextConfiguration} is also used by the {@link TestContext}
+ * as the context cache key for caching an
+ * {@link org.springframework.context.ApplicationContext ApplicationContext}
+ * that was loaded using properties of this {@code MergedContextConfiguration}.
+ * 
  * @author Sam Brannen
  * @since 3.1
  * @see ContextConfiguration
@@ -47,23 +53,19 @@ import org.springframework.util.StringUtils;
  * @see ContextConfigurationAttributes
  * @see SmartContextLoader#loadContext(MergedContextConfiguration)
  */
-public class MergedContextConfiguration {
+public class MergedContextConfiguration implements Serializable {
+
+	private static final long serialVersionUID = -3290560718464957422L;
 
 	private static final String[] EMPTY_STRING_ARRAY = new String[0];
 	private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
 
 	private final Class<?> testClass;
-
 	private final String[] locations;
-
 	private final Class<?>[] classes;
-
 	private final String[] activeProfiles;
-
 	private final ContextLoader contextLoader;
 
-	private final String contextKey;
-
 
 	private static String[] processLocations(String[] locations) {
 		return locations == null ? EMPTY_STRING_ARRAY : locations;
@@ -86,29 +88,16 @@ public class MergedContextConfiguration {
 	}
 
 	/**
-	 * Generate a null-safe {@link String} representation of the supplied {@link ContextLoader}.
+	 * Generate a null-safe {@link String} representation of the supplied
+	 * {@link ContextLoader} based solely on the fully qualified name of the
+	 * loader or &quot;null&quot; if the supplied loaded is <code>null</code>.
 	 */
 	private static String nullSafeToString(ContextLoader contextLoader) {
 		return contextLoader == null ? "null" : contextLoader.getClass().getName();
 	}
 
 	/**
-	 * Generate a context <em>key</em> from the supplied values.
-	 */
-	private static String generateContextKey(String[] locations, Class<?>[] classes, String[] activeProfiles,
-			ContextLoader contextLoader) {
-
-		String locationsKey = ObjectUtils.nullSafeToString(locations);
-		String classesKey = ObjectUtils.nullSafeToString(classes);
-		String activeProfilesKey = ObjectUtils.nullSafeToString(activeProfiles);
-		String contextLoaderKey = nullSafeToString(contextLoader);
-
-		return String.format("locations = %s, classes = %s, activeProfiles = %s, contextLoader = %s", locationsKey,
-			classesKey, activeProfilesKey, contextLoaderKey);
-	}
-
-	/**
-	 * Create a new <code>MergedContextConfiguration</code> instance for the
+	 * Create a new {@code MergedContextConfiguration} instance for the
 	 * supplied {@link Class test class}, resource locations, configuration
 	 * classes, active profiles, and {@link ContextLoader}.
 	 * <p>If a <code>null</code> value is supplied for <code>locations</code>,
@@ -128,12 +117,11 @@ public class MergedContextConfiguration {
 		this.classes = processClasses(classes);
 		this.activeProfiles = processActiveProfiles(activeProfiles);
 		this.contextLoader = contextLoader;
-		this.contextKey = generateContextKey(this.locations, this.classes, this.activeProfiles, this.contextLoader);
 	}
 
 	/**
 	 * Get the {@link Class test class} associated with this
-	 * <code>MergedContextConfiguration</code>.
+	 * {@code MergedContextConfiguration}.
 	 */
 	public Class<?> getTestClass() {
 		return testClass;
@@ -172,20 +160,59 @@ public class MergedContextConfiguration {
 	}
 
 	/**
-	 * Get the unique context key for all properties of this
-	 * <code>MergedContextConfiguration</code> excluding the
-	 * {@link #getTestClass() test class}. 
-	 * <p>Intended to be used for caching an 
-	 * {@link org.springframework.context.ApplicationContext ApplicationContext}
-	 * that was loaded using properties of this <code>MergedContextConfiguration</code>.
+	 * Generate a unique hash code for all properties of this
+	 * {@code MergedContextConfiguration} excluding the
+	 * {@link #getTestClass() test class}.
+	 */
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + Arrays.hashCode(locations);
+		result = prime * result + Arrays.hashCode(classes);
+		result = prime * result + Arrays.hashCode(activeProfiles);
+		result = prime * result + nullSafeToString(contextLoader).hashCode();
+		return result;
+	}
+
+	/**
+	 * TODO Document equals() implementation.
+	 *
+	 * @see java.lang.Object#equals(java.lang.Object)
 	 */
-	public String getContextKey() {
-		return contextKey;
+	@Override
+	public boolean equals(Object obj) {
+
+		if (this == obj) {
+			return true;
+		}
+		if (!(obj instanceof MergedContextConfiguration)) {
+			return false;
+		}
+
+		final MergedContextConfiguration that = (MergedContextConfiguration) obj;
+
+		if (!Arrays.equals(this.locations, that.locations)) {
+			return false;
+		}
+		if (!Arrays.equals(this.classes, that.classes)) {
+			return false;
+		}
+		if (!Arrays.equals(this.activeProfiles, that.activeProfiles)) {
+			return false;
+		}
+		if (!nullSafeToString(this.contextLoader).equals(nullSafeToString(that.contextLoader))) {
+			return false;
+		}
+
+		return true;
 	}
 
 	/**
-	 * Provide a String representation of the test class, merged context
-	 * configuration, and context key.
+	 * Provide a String representation of the {@link #getTestClass() test class},
+	 * {@link #getLocations() locations}, {@link #getClasses() configuration classes},
+	 * {@link #getActiveProfiles() active profiles}, and the name of the
+	 * {@link #getContextLoader() ContextLoader}.
 	 */
 	@Override
 	public String toString() {
@@ -195,7 +222,6 @@ public class MergedContextConfiguration {
 		.append("classes", ObjectUtils.nullSafeToString(classes))//
 		.append("activeProfiles", ObjectUtils.nullSafeToString(activeProfiles))//
 		.append("contextLoader", nullSafeToString(contextLoader))//
-		.append("contextKey", contextKey)//
 		.toString();
 	}
 

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

@@ -61,6 +61,7 @@ public class TestContext extends AttributeAccessorSupport {
 		this(testClass, contextCache, null);
 	}
 
+	// TODO Update regarding default --> DelegatingSmartContextLoader
 	/**
 	 * Construct a new test context for the supplied {@link Class test class}
 	 * and {@link ContextCache context cache} and parse the corresponding
@@ -141,18 +142,17 @@ public class TestContext extends AttributeAccessorSupport {
 	 * application context
 	 */
 	public ApplicationContext getApplicationContext() {
-		String contextKey = mergedContextConfiguration.getContextKey();
 		synchronized (contextCache) {
-			ApplicationContext context = contextCache.get(contextKey);
+			ApplicationContext context = contextCache.get(mergedContextConfiguration);
 			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));
+							mergedContextConfiguration));
 					}
-					contextCache.put(contextKey, context);
+					contextCache.put(mergedContextConfiguration, context);
 				}
 				catch (Exception ex) {
 					throw new IllegalStateException("Failed to load ApplicationContext", ex);
@@ -162,7 +162,7 @@ public class TestContext extends AttributeAccessorSupport {
 				if (logger.isDebugEnabled()) {
 					logger.debug(String.format(
 						"Retrieved ApplicationContext for test class [%s] from cache with key [%s].", testClass,
-						contextKey));
+						mergedContextConfiguration));
 				}
 			}
 			return context;
@@ -217,7 +217,7 @@ public class TestContext extends AttributeAccessorSupport {
 	 */
 	public void markApplicationContextDirty() {
 		synchronized (contextCache) {
-			contextCache.setDirty(mergedContextConfiguration.getContextKey());
+			contextCache.setDirty(mergedContextConfiguration);
 		}
 	}
 

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

+/*
+ * 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.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+import org.springframework.test.context.support.GenericXmlContextLoader;
+
+/**
+ * Unit tests for {@link MergedContextConfiguration}.
+ * 
+ * @author Sam Brannen
+ * @since 3.1
+ */
+public class MergedContextConfigurationTests {
+
+	private static final String[] EMPTY_STRING_ARRAY = new String[0];
+	private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
+
+	private final GenericXmlContextLoader loader = new GenericXmlContextLoader();
+
+
+	@Test
+	public void hashCodeWithNulls() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(null, null, null, null, null);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(null, null, null, null, null);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithNullArrays() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), null, null, null, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), null, null, null, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithEmptyArrays() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithEmptyArraysAndDifferentLoaders() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, new AnnotationConfigContextLoader());
+		assertFalse(mergedConfig1.hashCode() == mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithSameLocations() {
+		String[] locations = new String[] { "foo", "bar}" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), locations,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), locations,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithDifferentLocations() {
+		String[] locations1 = new String[] { "foo", "bar}" };
+		String[] locations2 = new String[] { "baz", "quux}" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), locations1,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), locations2,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		assertFalse(mergedConfig1.hashCode() == mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithSameConfigClasses() {
+		Class<?>[] classes = new Class<?>[] { String.class, Integer.class };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes, EMPTY_STRING_ARRAY, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithDifferentConfigClasses() {
+		Class<?>[] classes1 = new Class<?>[] { String.class, Integer.class };
+		Class<?>[] classes2 = new Class<?>[] { Boolean.class, Number.class };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes1, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes2, EMPTY_STRING_ARRAY, loader);
+		assertFalse(mergedConfig1.hashCode() == mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithSameProfiles() {
+		String[] activeProfiles = new String[] { "catbert", "dogbert" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithSameProfilesReversed() {
+		String[] activeProfiles1 = new String[] { "catbert", "dogbert" };
+		String[] activeProfiles2 = new String[] { "dogbert", "catbert" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles1, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles2, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithSameDuplicateProfiles() {
+		String[] activeProfiles1 = new String[] { "catbert", "dogbert" };
+		String[] activeProfiles2 = new String[] { "catbert", "dogbert", "catbert", "dogbert", "catbert" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles1, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles2, loader);
+		assertEquals(mergedConfig1.hashCode(), mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void hashCodeWithDifferentProfiles() {
+		String[] activeProfiles1 = new String[] { "catbert", "dogbert" };
+		String[] activeProfiles2 = new String[] { "X", "Y" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles1, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles2, loader);
+		assertFalse(mergedConfig1.hashCode() == mergedConfig2.hashCode());
+	}
+
+	@Test
+	public void equalsBasics() {
+		MergedContextConfiguration mergedConfig = new MergedContextConfiguration(null, null, null, null, null);
+		assertTrue(mergedConfig.equals(mergedConfig));
+		assertFalse(mergedConfig.equals(null));
+		assertFalse(mergedConfig.equals(new Integer(1)));
+	}
+
+	@Test
+	public void equalsWithNulls() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(null, null, null, null, null);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(null, null, null, null, null);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithNullArrays() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), null, null, null, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), null, null, null, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithEmptyArrays() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithEmptyArraysAndDifferentLoaders() {
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, new AnnotationConfigContextLoader());
+		assertFalse(mergedConfig1.equals(mergedConfig2));
+	}
+
+	@Test
+	public void equalsWithSameLocations() {
+		String[] locations = new String[] { "foo", "bar}" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), locations,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), locations,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithDifferentLocations() {
+		String[] locations1 = new String[] { "foo", "bar}" };
+		String[] locations2 = new String[] { "baz", "quux}" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), locations1,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), locations2,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		assertFalse(mergedConfig1.equals(mergedConfig2));
+	}
+
+	@Test
+	public void equalsWithSameConfigClasses() {
+		Class<?>[] classes = new Class<?>[] { String.class, Integer.class };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes, EMPTY_STRING_ARRAY, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithDifferentConfigClasses() {
+		Class<?>[] classes1 = new Class<?>[] { String.class, Integer.class };
+		Class<?>[] classes2 = new Class<?>[] { Boolean.class, Number.class };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes1, EMPTY_STRING_ARRAY, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			classes2, EMPTY_STRING_ARRAY, loader);
+		assertFalse(mergedConfig1.equals(mergedConfig2));
+	}
+
+	@Test
+	public void equalsWithSameProfiles() {
+		String[] activeProfiles = new String[] { "catbert", "dogbert" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithSameProfilesReversed() {
+		String[] activeProfiles1 = new String[] { "catbert", "dogbert" };
+		String[] activeProfiles2 = new String[] { "dogbert", "catbert" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles1, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles2, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithSameDuplicateProfiles() {
+		String[] activeProfiles1 = new String[] { "catbert", "dogbert" };
+		String[] activeProfiles2 = new String[] { "catbert", "dogbert", "catbert", "dogbert", "catbert" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles1, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles2, loader);
+		assertEquals(mergedConfig1, mergedConfig2);
+	}
+
+	@Test
+	public void equalsWithDifferentProfiles() {
+		String[] activeProfiles1 = new String[] { "catbert", "dogbert" };
+		String[] activeProfiles2 = new String[] { "X", "Y" };
+		MergedContextConfiguration mergedConfig1 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles1, loader);
+		MergedContextConfiguration mergedConfig2 = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, activeProfiles2, loader);
+		assertFalse(mergedConfig1.equals(mergedConfig2));
+	}
+
+}