Added tests

org.springframework.core/src/main/java/org/springframework/util/DefaultMultiValueMap.java

@@ -17,6 +17,7 @@
 package org.springframework.util;
 
 import java.util.Collection;
+import java.util.LinkedHashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -32,6 +33,18 @@ public class DefaultMultiValueMap<K, V> implements MultiValueMap<K, V> {
 
 	private final Map<K, List<V>> wrappee;
 
+	/**
+	 * Constructs a new intance of the {@code DefaultMultiValueMap} wrapping a plain {@link LinkedHashMap}.
+	 */
+	public DefaultMultiValueMap() {
+		this(new LinkedHashMap<K, List<V>>());
+	}
+
+	/**
+	 * Constructs a new intance of the {@code DefaultMultiValueMap} wrapping the given map.
+	 *
+	 * @param wrappee the map to be wrapped
+	 */
 	public DefaultMultiValueMap(Map<K, List<V>> wrappee) {
 		Assert.notNull(wrappee, "'wrappee' must not be null");
 		this.wrappee = wrappee;
@@ -112,4 +125,20 @@ public class DefaultMultiValueMap<K, V> implements MultiValueMap<K, V> {
 	public Set<Entry<K, List<V>>> entrySet() {
 		return wrappee.entrySet();
 	}
+
+	@Override
+	public int hashCode() {
+		return wrappee.hashCode();
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		return this.wrappee.equals(obj);
+	}
+
+	@Override
+	public String toString() {
+		return wrappee.toString();
+	}
+
 }

org.springframework.core/src/test/java/org/springframework/util/DefaultMultiValueMapTests.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2002-2009 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.util;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.Assert.*;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class DefaultMultiValueMapTests {
+
+	private DefaultMultiValueMap<String, String> map;
+
+	@Before
+	public void setUp() {
+		map = new DefaultMultiValueMap<String, String>();
+	}
+
+	@Test
+	public void add() {
+		map.add("key", "value1");
+		map.add("key", "value2");
+		assertEquals(1, map.size());
+		List<String> expected = new ArrayList<String>(2);
+		expected.add("value1");
+		expected.add("value2");
+		assertEquals(expected, map.get("key"));
+	}
+
+	@Test
+	public void getFirst() {
+		List<String> values = new ArrayList<String>(2);
+		values.add("value1");
+		values.add("value2");
+		map.put("key", values);
+		assertEquals("value1", map.getFirst("key"));
+		assertNull(map.getFirst("other"));
+	}
+
+	@Test
+	public void set() {
+		map.set("key", "value1");
+		map.set("key", "value2");
+		assertEquals(1, map.size());
+		assertEquals(Collections.singletonList("value2"), map.get("key"));
+	}
+
+	@Test
+	public void equals() {
+		map.set("key1", "value1");
+		assertEquals(map, map);
+		MultiValueMap<String, String> o1 = new DefaultMultiValueMap<String, String>();
+		o1.set("key1", "value1");
+		assertEquals(map, o1);
+		assertEquals(o1, map);
+		Map<String, List<String>> o2 = new HashMap<String, List<String>>();
+		o2.put("key1", Collections.singletonList("value1"));
+		assertEquals(map, o2);
+		assertEquals(o2, map);
+	}
+}