Add unit tests for DictionaryExtensions, apache#920

src/Lucene.Net.Tests/Support/TestDictionaryExtensions.cs

@@ -0,0 +1,70 @@
+using Lucene.Net.Attributes;
+using Lucene.Net.Util;
+using NUnit.Framework;
+using System.Collections.Generic;
+
+namespace Lucene.Net.Support
+{
+    /*
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You 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.
+     */
+
+    [TestFixture]
+    public class TestDictionaryExtensions : LuceneTestCase
+    {
+        [Test, LuceneNetSpecific]
+        public void TestPutAll()
+        {
+            var dictionary1 = new Dictionary<string, string>
+            {
+                { "key1", "value1" },
+                { "key2", "value2" }
+            };
+            var dictionary2 = new Dictionary<string, string>
+            {
+                { "key1", "value1.1" },
+                { "key3", "value3" }
+            };
+
+            dictionary1.PutAll(dictionary2);
+
+            Assert.AreEqual(3, dictionary1.Count);
+            Assert.AreEqual("value1.1", dictionary1["key1"]);
+            Assert.AreEqual("value2", dictionary1["key2"]);
+            Assert.AreEqual("value3", dictionary1["key3"]);
+        }
+
+        [Test, LuceneNetSpecific]
+        public void TestPut()
+        {
+            var dictionary = new Dictionary<string, string>
+            {
+                { "key1", "value1" },
+                { "key2", "value2" }
+            };
+
+            var oldFirst = dictionary.Put("key1", "value1.1");
+            var oldSecond = dictionary.Put("key3", "value3");
+
+            Assert.AreEqual(3, dictionary.Count);
+            Assert.AreEqual("value1.1", dictionary["key1"]);
+            Assert.AreEqual("value2", dictionary["key2"]);
+            Assert.AreEqual("value3", dictionary["key3"]);
+            Assert.AreEqual("value1", oldFirst);
+            Assert.IsNull(oldSecond);
+        }
+    }
+}