csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs - third_party/protobuf - Git at Google

 #region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
 // Copyright 2015 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion

 using System;
 using System.Collections.Generic;
 using Google.Protobuf.TestProtos;
 using NUnit.Framework;
 using System.Collections;
 using System.Linq;

 namespace Google.Protobuf.Collections
 {
     /// <summary>
     /// Tests for MapField which aren't reliant on the encoded format -
     /// tests for serialization/deserialization are part of GeneratedMessageTest.
     /// </summary>
     public class MapFieldTest
     {
         [Test]
         public void Clone_ClonesMessages()
         {
             var message = new ForeignMessage { C = 20 };
             var map = new MapField<string, ForeignMessage> { { "x", message } };
             var clone = map.Clone();
             map["x"].C = 30;
             Assert.AreEqual(20, clone["x"].C);
         }

         [Test]
         public void NullValuesProhibited()
         {
             TestNullValues<int?>(0);
             TestNullValues("");
             TestNullValues(new TestAllTypes());
         }

         private void TestNullValues<T>(T nonNullValue)
         {
             var map = new MapField<int, T>();
             var nullValue = (T) (object) null;
             Assert.Throws<ArgumentNullException>(() => map.Add(0, nullValue));
             Assert.Throws<ArgumentNullException>(() => map[0] = nullValue);
             map.Add(1, nonNullValue);
             map[1] = nonNullValue;
         }

         [Test]
         public void Add_ForbidsNullKeys()
         {
             var map = new MapField<string, ForeignMessage>();
             Assert.Throws<ArgumentNullException>(() => map.Add(null, new ForeignMessage()));
         }

         [Test]
         public void Indexer_ForbidsNullKeys()
         {
             var map = new MapField<string, ForeignMessage>();
             Assert.Throws<ArgumentNullException>(() => map[null] = new ForeignMessage());
         }

         [Test]
         public void AddPreservesInsertionOrder()
         {
             var map = new MapField<string, string>();
             map.Add("a", "v1");
             map.Add("b", "v2");
             map.Add("c", "v3");
             map.Remove("b");
             map.Add("d", "v4");
             CollectionAssert.AreEqual(new[] { "a", "c", "d" }, map.Keys);
             CollectionAssert.AreEqual(new[] { "v1", "v3", "v4" }, map.Values);
         }

         [Test]
         public void EqualityIsOrderInsensitive()
         {
             var map1 = new MapField<string, string>();
             map1.Add("a", "v1");
             map1.Add("b", "v2");

             var map2 = new MapField<string, string>();
             map2.Add("b", "v2");
             map2.Add("a", "v1");

             EqualityTester.AssertEquality(map1, map2);
         }

         [Test]
         public void EqualityIsKeySensitive()
         {
             var map1 = new MapField<string, string>();
             map1.Add("first key", "v1");
             map1.Add("second key", "v2");

             var map2 = new MapField<string, string>();
             map2.Add("third key", "v1");
             map2.Add("fourth key", "v2");

             EqualityTester.AssertInequality(map1, map2);
         }

         [Test]
         public void Equality_Simple()
         {
             var map = new MapField<string, string>();
             EqualityTester.AssertEquality(map, map);
             EqualityTester.AssertInequality(map, null);
             Assert.IsFalse(map.Equals(new object()));
         }

         [Test]
         public void EqualityIsValueSensitive()
         {
             // Note: Without some care, it's a little easier than one might
             // hope to see hash collisions, but only in some environments...
             var map1 = new MapField<string, string>();
             map1.Add("a", "first value");
             map1.Add("b", "second value");

             var map2 = new MapField<string, string>();
             map2.Add("a", "third value");
             map2.Add("b", "fourth value");

             EqualityTester.AssertInequality(map1, map2);
         }

         [Test]
         public void Add_Dictionary()
         {
             var map1 = new MapField<string, string>
             {
                 { "x", "y" },
                 { "a", "b" }
             };
             var map2 = new MapField<string, string>
             {
                 { "before", "" },
                 map1,
                 { "after", "" }
             };
             var expected = new MapField<string, string>
             {
                 { "before", "" },
                 { "x", "y" },
                 { "a", "b" },
                 { "after", "" }
             };
             Assert.AreEqual(expected, map2);
             CollectionAssert.AreEqual(new[] { "before", "x", "a", "after" }, map2.Keys);
         }

         // General IDictionary<TKey, TValue> behavior tests
         [Test]
         public void Add_KeyAlreadyExists()
         {
             var map = new MapField<string, string>();
             map.Add("foo", "bar");
             Assert.Throws<ArgumentException>(() => map.Add("foo", "baz"));
         }

         [Test]
         public void Add_Pair()
         {
             var map = new MapField<string, string>();
             ICollection<KeyValuePair<string, string>> collection = map;
             collection.Add(NewKeyValuePair("x", "y"));
             Assert.AreEqual("y", map["x"]);
             Assert.Throws<ArgumentException>(() => collection.Add(NewKeyValuePair("x", "z")));
         }

         [Test]
         public void Contains_Pair()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             ICollection<KeyValuePair<string, string>> collection = map;
             Assert.IsTrue(collection.Contains(NewKeyValuePair("x", "y")));
             Assert.IsFalse(collection.Contains(NewKeyValuePair("x", "z")));
             Assert.IsFalse(collection.Contains(NewKeyValuePair("z", "y")));
         }

         [Test]
         public void Remove_Key()
         {
             var map = new MapField<string, string>();
             map.Add("foo", "bar");
             Assert.AreEqual(1, map.Count);
             Assert.IsFalse(map.Remove("missing"));
             Assert.AreEqual(1, map.Count);
             Assert.IsTrue(map.Remove("foo"));
             Assert.AreEqual(0, map.Count);
             Assert.Throws<ArgumentNullException>(() => map.Remove(null));
         }

         [Test]
         public void Remove_Pair()
         {
             var map = new MapField<string, string>();
             map.Add("foo", "bar");
             ICollection<KeyValuePair<string, string>> collection = map;
             Assert.AreEqual(1, map.Count);
             Assert.IsFalse(collection.Remove(NewKeyValuePair("wrong key", "bar")));
             Assert.AreEqual(1, map.Count);
             Assert.IsFalse(collection.Remove(NewKeyValuePair("foo", "wrong value")));
             Assert.AreEqual(1, map.Count);
             Assert.IsTrue(collection.Remove(NewKeyValuePair("foo", "bar")));
             Assert.AreEqual(0, map.Count);
             Assert.Throws<ArgumentException>(() => collection.Remove(new KeyValuePair<string, string>(null, "")));
         }

         [Test]
         public void CopyTo_Pair()
         {
             var map = new MapField<string, string>();
             map.Add("foo", "bar");
             ICollection<KeyValuePair<string, string>> collection = map;
             KeyValuePair<string, string>[] array = new KeyValuePair<string, string>[3];
             collection.CopyTo(array, 1);
             Assert.AreEqual(NewKeyValuePair("foo", "bar"), array[1]);
         }

         [Test]
         public void Clear()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             Assert.AreEqual(1, map.Count);
             map.Clear();
             Assert.AreEqual(0, map.Count);
             map.Add("x", "y");
             Assert.AreEqual(1, map.Count);
         }

         [Test]
         public void Indexer_Get()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             Assert.AreEqual("y", map["x"]);
             Assert.Throws<KeyNotFoundException>(() => { var ignored = map["z"]; });
         }

         [Test]
         public void Indexer_Set()
         {
             var map = new MapField<string, string>();
             map["x"] = "y";
             Assert.AreEqual("y", map["x"]);
             map["x"] = "z"; // This won't throw, unlike Add.
             Assert.AreEqual("z", map["x"]);
         }

         [Test]
         public void GetEnumerator_NonGeneric()
         {
             IEnumerable map = new MapField<string, string> { { "x", "y" } };
             CollectionAssert.AreEqual(new[] { new KeyValuePair<string, string>("x", "y") },
                 map.Cast<object>().ToList());
         }

         // Test for the explicitly-implemented non-generic IDictionary interface
         [Test]
         public void IDictionary_GetEnumerator()
         {
             IDictionary map = new MapField<string, string> { { "x", "y" } };
             var enumerator = map.GetEnumerator();

             // Commented assertions show an ideal situation - it looks like
             // the LinkedList enumerator doesn't throw when you ask for the current entry
             // at an inappropriate time; fixing this would be more work than it's worth.
             // Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
             Assert.IsTrue(enumerator.MoveNext());
             Assert.AreEqual("x", enumerator.Key);
             Assert.AreEqual("y", enumerator.Value);
             Assert.AreEqual(new DictionaryEntry("x", "y"), enumerator.Current);
             Assert.AreEqual(new DictionaryEntry("x", "y"), enumerator.Entry);
             Assert.IsFalse(enumerator.MoveNext());
             // Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
             enumerator.Reset();
             // Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
             Assert.IsTrue(enumerator.MoveNext());
             Assert.AreEqual("x", enumerator.Key); // Assume the rest are okay
         }

         [Test]
         public void IDictionary_Add()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;
             dictionary.Add("a", "b");
             Assert.AreEqual("b", map["a"]);
             Assert.Throws<ArgumentException>(() => dictionary.Add("a", "duplicate"));
             Assert.Throws<InvalidCastException>(() => dictionary.Add(new object(), "key is bad"));
             Assert.Throws<InvalidCastException>(() => dictionary.Add("value is bad", new object()));
         }

         [Test]
         public void IDictionary_Contains()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;

             Assert.IsFalse(dictionary.Contains("a"));
             Assert.IsFalse(dictionary.Contains(5));
             // Surprising, but IDictionary.Contains is only about keys.
             Assert.IsFalse(dictionary.Contains(new DictionaryEntry("x", "y")));
             Assert.IsTrue(dictionary.Contains("x"));
         }

         [Test]
         public void IDictionary_Remove()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;
             dictionary.Remove("a");
             Assert.AreEqual(1, dictionary.Count);
             dictionary.Remove(5);
             Assert.AreEqual(1, dictionary.Count);
             dictionary.Remove(new DictionaryEntry("x", "y"));
             Assert.AreEqual(1, dictionary.Count);
             dictionary.Remove("x");
             Assert.AreEqual(0, dictionary.Count);
             Assert.Throws<ArgumentNullException>(() => dictionary.Remove(null));
         }

         [Test]
         public void IDictionary_CopyTo()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;
             var array = new DictionaryEntry[3];
             dictionary.CopyTo(array, 1);
             CollectionAssert.AreEqual(new[] { default(DictionaryEntry), new DictionaryEntry("x", "y"), default(DictionaryEntry) },
                 array);
             var objectArray = new object[3];
             dictionary.CopyTo(objectArray, 1);
             CollectionAssert.AreEqual(new object[] { null, new DictionaryEntry("x", "y"), null },
                 objectArray);
         }

         [Test]
         public void IDictionary_IsFixedSize()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;
             Assert.IsFalse(dictionary.IsFixedSize);
         }

         [Test]
         public void IDictionary_Keys()
         {
             IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
             CollectionAssert.AreEqual(new[] { "x" }, dictionary.Keys);
         }

         [Test]
         public void IDictionary_Values()
         {
             IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
             CollectionAssert.AreEqual(new[] { "y" }, dictionary.Values);
         }

         [Test]
         public void IDictionary_IsSynchronized()
         {
             IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
             Assert.IsFalse(dictionary.IsSynchronized);
         }

         [Test]
         public void IDictionary_SyncRoot()
         {
             IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
             Assert.AreSame(dictionary, dictionary.SyncRoot);
         }

         [Test]
         public void IDictionary_Indexer_Get()
         {
             IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
             Assert.AreEqual("y", dictionary["x"]);
             Assert.IsNull(dictionary["a"]);
             Assert.IsNull(dictionary[5]);
             Assert.Throws<ArgumentNullException>(() => dictionary[null].GetHashCode());
         }

         [Test]
         public void IDictionary_Indexer_Set()
         {
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;
             map["a"] = "b";
             Assert.AreEqual("b", map["a"]);
             map["a"] = "c";
             Assert.AreEqual("c", map["a"]);
             Assert.Throws<InvalidCastException>(() => dictionary[5] = "x");
             Assert.Throws<InvalidCastException>(() => dictionary["x"] = 5);
             Assert.Throws<ArgumentNullException>(() => dictionary[null] = "z");
             Assert.Throws<ArgumentNullException>(() => dictionary["x"] = null);
         }

         [Test]
         public void KeysReturnsLiveView()
         {
             var map = new MapField<string, string>();
             var keys = map.Keys;
             CollectionAssert.AreEqual(new string[0], keys);
             map["foo"] = "bar";
             map["x"] = "y";
             CollectionAssert.AreEqual(new[] { "foo", "x" }, keys);
         }

         [Test]
         public void ValuesReturnsLiveView()
         {
             var map = new MapField<string, string>();
             var values = map.Values;
             CollectionAssert.AreEqual(new string[0], values);
             map["foo"] = "bar";
             map["x"] = "y";
             CollectionAssert.AreEqual(new[] { "bar", "y" }, values);
         }

         // Just test keys - we know the implementation is the same for values
         [Test]
         public void ViewsAreReadOnly()
         {
             var map = new MapField<string, string>();
             var keys = map.Keys;
             Assert.IsTrue(keys.IsReadOnly);
             Assert.Throws<NotSupportedException>(() => keys.Clear());
             Assert.Throws<NotSupportedException>(() => keys.Remove("a"));
             Assert.Throws<NotSupportedException>(() => keys.Add("a"));
         }

         // Just test keys - we know the implementation is the same for values
         [Test]
         public void ViewCopyTo()
         {
             var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
             var keys = map.Keys;
             var array = new string[4];
             Assert.Throws<ArgumentException>(() => keys.CopyTo(array, 3));
             Assert.Throws<ArgumentOutOfRangeException>(() => keys.CopyTo(array, -1));
             keys.CopyTo(array, 1);
             CollectionAssert.AreEqual(new[] { null, "foo", "x", null }, array);
         }

         // Just test keys - we know the implementation is the same for values
         [Test]
         public void NonGenericViewCopyTo()
         {
             IDictionary map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
             ICollection keys = map.Keys;
             // Note the use of the Array type here rather than string[]
             Array array = new string[4];
             Assert.Throws<ArgumentException>(() => keys.CopyTo(array, 3));
             Assert.Throws<ArgumentOutOfRangeException>(() => keys.CopyTo(array, -1));
             keys.CopyTo(array, 1);
             CollectionAssert.AreEqual(new[] { null, "foo", "x", null }, array);
         }

         [Test]
         public void KeysContains()
         {
             var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
             var keys = map.Keys;
             Assert.IsTrue(keys.Contains("foo"));
             Assert.IsFalse(keys.Contains("bar")); // It's a value!
             Assert.IsFalse(keys.Contains("1"));
             // Keys can't be null, so we should prevent contains check
             Assert.Throws<ArgumentNullException>(() => keys.Contains(null));
         }

         [Test]
         public void ValuesContains()
         {
             var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
             var values = map.Values;
             Assert.IsTrue(values.Contains("bar"));
             Assert.IsFalse(values.Contains("foo")); // It's a key!
             Assert.IsFalse(values.Contains("1"));
             // Values can be null, so this makes sense
             Assert.IsFalse(values.Contains(null));
         }

         [Test]
         public void ToString_StringToString()
         {
             var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
             Assert.AreEqual("{ \"foo\": \"bar\", \"x\": \"y\" }", map.ToString());
         }

         [Test]
         public void ToString_UnsupportedKeyType()
         {
             var map = new MapField<byte, string> { { 10, "foo" } };
             Assert.Throws<ArgumentException>(() => map.ToString());
         }

         private static KeyValuePair<TKey, TValue> NewKeyValuePair<TKey, TValue>(TKey key, TValue value)
         {
             return new KeyValuePair<TKey, TValue>(key, value);
         }
     }
 }
	#region Copyright notice and license
	// Protocol Buffers - Google's data interchange format
	// Copyright 2015 Google Inc. All rights reserved.
	// https://developers.google.com/protocol-buffers/
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are
	// met:
	//
	// * Redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above
	// copyright notice, this list of conditions and the following disclaimer
	// in the documentation and/or other materials provided with the
	// distribution.
	// * Neither the name of Google Inc. nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	#endregion

	using System;
	using System.Collections.Generic;
	using Google.Protobuf.TestProtos;
	using NUnit.Framework;
	using System.Collections;
	using System.Linq;

	namespace Google.Protobuf.Collections
	{
	/// <summary>
	/// Tests for MapField which aren't reliant on the encoded format -
	/// tests for serialization/deserialization are part of GeneratedMessageTest.
	/// </summary>
	public class MapFieldTest
	{
	[Test]
	public void Clone_ClonesMessages()
	{
	var message = new ForeignMessage { C = 20 };
	var map = new MapField<string, ForeignMessage> { { "x", message } };
	var clone = map.Clone();
	map["x"].C = 30;
	Assert.AreEqual(20, clone["x"].C);
	}

	[Test]
	public void NullValuesProhibited()
	{
	TestNullValues<int?>(0);
	TestNullValues("");
	TestNullValues(new TestAllTypes());
	}

	private void TestNullValues<T>(T nonNullValue)
	{
	var map = new MapField<int, T>();
	var nullValue = (T) (object) null;
	Assert.Throws<ArgumentNullException>(() => map.Add(0, nullValue));
	Assert.Throws<ArgumentNullException>(() => map[0] = nullValue);
	map.Add(1, nonNullValue);
	map[1] = nonNullValue;
	}

	[Test]
	public void Add_ForbidsNullKeys()
	{
	var map = new MapField<string, ForeignMessage>();
	Assert.Throws<ArgumentNullException>(() => map.Add(null, new ForeignMessage()));
	}

	[Test]
	public void Indexer_ForbidsNullKeys()
	{
	var map = new MapField<string, ForeignMessage>();
	Assert.Throws<ArgumentNullException>(() => map[null] = new ForeignMessage());
	}

	[Test]
	public void AddPreservesInsertionOrder()
	{
	var map = new MapField<string, string>();
	map.Add("a", "v1");
	map.Add("b", "v2");
	map.Add("c", "v3");
	map.Remove("b");
	map.Add("d", "v4");
	CollectionAssert.AreEqual(new[] { "a", "c", "d" }, map.Keys);
	CollectionAssert.AreEqual(new[] { "v1", "v3", "v4" }, map.Values);
	}

	[Test]
	public void EqualityIsOrderInsensitive()
	{
	var map1 = new MapField<string, string>();
	map1.Add("a", "v1");
	map1.Add("b", "v2");

	var map2 = new MapField<string, string>();
	map2.Add("b", "v2");
	map2.Add("a", "v1");

	EqualityTester.AssertEquality(map1, map2);
	}

	[Test]
	public void EqualityIsKeySensitive()
	{
	var map1 = new MapField<string, string>();
	map1.Add("first key", "v1");
	map1.Add("second key", "v2");

	var map2 = new MapField<string, string>();
	map2.Add("third key", "v1");
	map2.Add("fourth key", "v2");

	EqualityTester.AssertInequality(map1, map2);
	}

	[Test]
	public void Equality_Simple()
	{
	var map = new MapField<string, string>();
	EqualityTester.AssertEquality(map, map);
	EqualityTester.AssertInequality(map, null);
	Assert.IsFalse(map.Equals(new object()));
	}

	[Test]
	public void EqualityIsValueSensitive()
	{
	// Note: Without some care, it's a little easier than one might
	// hope to see hash collisions, but only in some environments...
	var map1 = new MapField<string, string>();
	map1.Add("a", "first value");
	map1.Add("b", "second value");

	var map2 = new MapField<string, string>();
	map2.Add("a", "third value");
	map2.Add("b", "fourth value");

	EqualityTester.AssertInequality(map1, map2);
	}

	[Test]
	public void Add_Dictionary()
	{
	var map1 = new MapField<string, string>
	{
	{ "x", "y" },
	{ "a", "b" }
	};
	var map2 = new MapField<string, string>
	{
	{ "before", "" },
	map1,
	{ "after", "" }
	};
	var expected = new MapField<string, string>
	{
	{ "before", "" },
	{ "x", "y" },
	{ "a", "b" },
	{ "after", "" }
	};
	Assert.AreEqual(expected, map2);
	CollectionAssert.AreEqual(new[] { "before", "x", "a", "after" }, map2.Keys);
	}

	// General IDictionary<TKey, TValue> behavior tests
	[Test]
	public void Add_KeyAlreadyExists()
	{
	var map = new MapField<string, string>();
	map.Add("foo", "bar");
	Assert.Throws<ArgumentException>(() => map.Add("foo", "baz"));
	}

	[Test]
	public void Add_Pair()
	{
	var map = new MapField<string, string>();
	ICollection<KeyValuePair<string, string>> collection = map;
	collection.Add(NewKeyValuePair("x", "y"));
	Assert.AreEqual("y", map["x"]);
	Assert.Throws<ArgumentException>(() => collection.Add(NewKeyValuePair("x", "z")));
	}

	[Test]
	public void Contains_Pair()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	ICollection<KeyValuePair<string, string>> collection = map;
	Assert.IsTrue(collection.Contains(NewKeyValuePair("x", "y")));
	Assert.IsFalse(collection.Contains(NewKeyValuePair("x", "z")));
	Assert.IsFalse(collection.Contains(NewKeyValuePair("z", "y")));
	}

	[Test]
	public void Remove_Key()
	{
	var map = new MapField<string, string>();
	map.Add("foo", "bar");
	Assert.AreEqual(1, map.Count);
	Assert.IsFalse(map.Remove("missing"));
	Assert.AreEqual(1, map.Count);
	Assert.IsTrue(map.Remove("foo"));
	Assert.AreEqual(0, map.Count);
	Assert.Throws<ArgumentNullException>(() => map.Remove(null));
	}

	[Test]
	public void Remove_Pair()
	{
	var map = new MapField<string, string>();
	map.Add("foo", "bar");
	ICollection<KeyValuePair<string, string>> collection = map;
	Assert.AreEqual(1, map.Count);
	Assert.IsFalse(collection.Remove(NewKeyValuePair("wrong key", "bar")));
	Assert.AreEqual(1, map.Count);
	Assert.IsFalse(collection.Remove(NewKeyValuePair("foo", "wrong value")));
	Assert.AreEqual(1, map.Count);
	Assert.IsTrue(collection.Remove(NewKeyValuePair("foo", "bar")));
	Assert.AreEqual(0, map.Count);
	Assert.Throws<ArgumentException>(() => collection.Remove(new KeyValuePair<string, string>(null, "")));
	}

	[Test]
	public void CopyTo_Pair()
	{
	var map = new MapField<string, string>();
	map.Add("foo", "bar");
	ICollection<KeyValuePair<string, string>> collection = map;
	KeyValuePair<string, string>[] array = new KeyValuePair<string, string>[3];
	collection.CopyTo(array, 1);
	Assert.AreEqual(NewKeyValuePair("foo", "bar"), array[1]);
	}

	[Test]
	public void Clear()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	Assert.AreEqual(1, map.Count);
	map.Clear();
	Assert.AreEqual(0, map.Count);
	map.Add("x", "y");
	Assert.AreEqual(1, map.Count);
	}

	[Test]
	public void Indexer_Get()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	Assert.AreEqual("y", map["x"]);
	Assert.Throws<KeyNotFoundException>(() => { var ignored = map["z"]; });
	}

	[Test]
	public void Indexer_Set()
	{
	var map = new MapField<string, string>();
	map["x"] = "y";
	Assert.AreEqual("y", map["x"]);
	map["x"] = "z"; // This won't throw, unlike Add.
	Assert.AreEqual("z", map["x"]);
	}

	[Test]
	public void GetEnumerator_NonGeneric()
	{
	IEnumerable map = new MapField<string, string> { { "x", "y" } };
	CollectionAssert.AreEqual(new[] { new KeyValuePair<string, string>("x", "y") },
	map.Cast<object>().ToList());
	}

	// Test for the explicitly-implemented non-generic IDictionary interface
	[Test]
	public void IDictionary_GetEnumerator()
	{
	IDictionary map = new MapField<string, string> { { "x", "y" } };
	var enumerator = map.GetEnumerator();

	// Commented assertions show an ideal situation - it looks like
	// the LinkedList enumerator doesn't throw when you ask for the current entry
	// at an inappropriate time; fixing this would be more work than it's worth.
	// Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
	Assert.IsTrue(enumerator.MoveNext());
	Assert.AreEqual("x", enumerator.Key);
	Assert.AreEqual("y", enumerator.Value);
	Assert.AreEqual(new DictionaryEntry("x", "y"), enumerator.Current);
	Assert.AreEqual(new DictionaryEntry("x", "y"), enumerator.Entry);
	Assert.IsFalse(enumerator.MoveNext());
	// Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
	enumerator.Reset();
	// Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
	Assert.IsTrue(enumerator.MoveNext());
	Assert.AreEqual("x", enumerator.Key); // Assume the rest are okay
	}

	[Test]
	public void IDictionary_Add()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	IDictionary dictionary = map;
	dictionary.Add("a", "b");
	Assert.AreEqual("b", map["a"]);
	Assert.Throws<ArgumentException>(() => dictionary.Add("a", "duplicate"));
	Assert.Throws<InvalidCastException>(() => dictionary.Add(new object(), "key is bad"));
	Assert.Throws<InvalidCastException>(() => dictionary.Add("value is bad", new object()));
	}

	[Test]
	public void IDictionary_Contains()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	IDictionary dictionary = map;

	Assert.IsFalse(dictionary.Contains("a"));
	Assert.IsFalse(dictionary.Contains(5));
	// Surprising, but IDictionary.Contains is only about keys.
	Assert.IsFalse(dictionary.Contains(new DictionaryEntry("x", "y")));
	Assert.IsTrue(dictionary.Contains("x"));
	}

	[Test]
	public void IDictionary_Remove()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	IDictionary dictionary = map;
	dictionary.Remove("a");
	Assert.AreEqual(1, dictionary.Count);
	dictionary.Remove(5);
	Assert.AreEqual(1, dictionary.Count);
	dictionary.Remove(new DictionaryEntry("x", "y"));
	Assert.AreEqual(1, dictionary.Count);
	dictionary.Remove("x");
	Assert.AreEqual(0, dictionary.Count);
	Assert.Throws<ArgumentNullException>(() => dictionary.Remove(null));
	}

	[Test]
	public void IDictionary_CopyTo()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	IDictionary dictionary = map;
	var array = new DictionaryEntry[3];
	dictionary.CopyTo(array, 1);
	CollectionAssert.AreEqual(new[] { default(DictionaryEntry), new DictionaryEntry("x", "y"), default(DictionaryEntry) },
	array);
	var objectArray = new object[3];
	dictionary.CopyTo(objectArray, 1);
	CollectionAssert.AreEqual(new object[] { null, new DictionaryEntry("x", "y"), null },
	objectArray);
	}

	[Test]
	public void IDictionary_IsFixedSize()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	IDictionary dictionary = map;
	Assert.IsFalse(dictionary.IsFixedSize);
	}

	[Test]
	public void IDictionary_Keys()
	{
	IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
	CollectionAssert.AreEqual(new[] { "x" }, dictionary.Keys);
	}

	[Test]
	public void IDictionary_Values()
	{
	IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
	CollectionAssert.AreEqual(new[] { "y" }, dictionary.Values);
	}

	[Test]
	public void IDictionary_IsSynchronized()
	{
	IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
	Assert.IsFalse(dictionary.IsSynchronized);
	}

	[Test]
	public void IDictionary_SyncRoot()
	{
	IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
	Assert.AreSame(dictionary, dictionary.SyncRoot);
	}

	[Test]
	public void IDictionary_Indexer_Get()
	{
	IDictionary dictionary = new MapField<string, string> { { "x", "y" } };
	Assert.AreEqual("y", dictionary["x"]);
	Assert.IsNull(dictionary["a"]);
	Assert.IsNull(dictionary[5]);
	Assert.Throws<ArgumentNullException>(() => dictionary[null].GetHashCode());
	}

	[Test]
	public void IDictionary_Indexer_Set()
	{
	var map = new MapField<string, string> { { "x", "y" } };
	IDictionary dictionary = map;
	map["a"] = "b";
	Assert.AreEqual("b", map["a"]);
	map["a"] = "c";
	Assert.AreEqual("c", map["a"]);
	Assert.Throws<InvalidCastException>(() => dictionary[5] = "x");
	Assert.Throws<InvalidCastException>(() => dictionary["x"] = 5);
	Assert.Throws<ArgumentNullException>(() => dictionary[null] = "z");
	Assert.Throws<ArgumentNullException>(() => dictionary["x"] = null);
	}

	[Test]
	public void KeysReturnsLiveView()
	{
	var map = new MapField<string, string>();
	var keys = map.Keys;
	CollectionAssert.AreEqual(new string[0], keys);
	map["foo"] = "bar";
	map["x"] = "y";
	CollectionAssert.AreEqual(new[] { "foo", "x" }, keys);
	}

	[Test]
	public void ValuesReturnsLiveView()
	{
	var map = new MapField<string, string>();
	var values = map.Values;
	CollectionAssert.AreEqual(new string[0], values);
	map["foo"] = "bar";
	map["x"] = "y";
	CollectionAssert.AreEqual(new[] { "bar", "y" }, values);
	}

	// Just test keys - we know the implementation is the same for values
	[Test]
	public void ViewsAreReadOnly()
	{
	var map = new MapField<string, string>();
	var keys = map.Keys;
	Assert.IsTrue(keys.IsReadOnly);
	Assert.Throws<NotSupportedException>(() => keys.Clear());
	Assert.Throws<NotSupportedException>(() => keys.Remove("a"));
	Assert.Throws<NotSupportedException>(() => keys.Add("a"));
	}

	// Just test keys - we know the implementation is the same for values
	[Test]
	public void ViewCopyTo()
	{
	var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
	var keys = map.Keys;
	var array = new string[4];
	Assert.Throws<ArgumentException>(() => keys.CopyTo(array, 3));
	Assert.Throws<ArgumentOutOfRangeException>(() => keys.CopyTo(array, -1));
	keys.CopyTo(array, 1);
	CollectionAssert.AreEqual(new[] { null, "foo", "x", null }, array);
	}

	// Just test keys - we know the implementation is the same for values
	[Test]
	public void NonGenericViewCopyTo()
	{
	IDictionary map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
	ICollection keys = map.Keys;
	// Note the use of the Array type here rather than string[]
	Array array = new string[4];
	Assert.Throws<ArgumentException>(() => keys.CopyTo(array, 3));
	Assert.Throws<ArgumentOutOfRangeException>(() => keys.CopyTo(array, -1));
	keys.CopyTo(array, 1);
	CollectionAssert.AreEqual(new[] { null, "foo", "x", null }, array);
	}

	[Test]
	public void KeysContains()
	{
	var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
	var keys = map.Keys;
	Assert.IsTrue(keys.Contains("foo"));
	Assert.IsFalse(keys.Contains("bar")); // It's a value!
	Assert.IsFalse(keys.Contains("1"));
	// Keys can't be null, so we should prevent contains check
	Assert.Throws<ArgumentNullException>(() => keys.Contains(null));
	}

	[Test]
	public void ValuesContains()
	{
	var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
	var values = map.Values;
	Assert.IsTrue(values.Contains("bar"));
	Assert.IsFalse(values.Contains("foo")); // It's a key!
	Assert.IsFalse(values.Contains("1"));
	// Values can be null, so this makes sense
	Assert.IsFalse(values.Contains(null));
	}

	[Test]
	public void ToString_StringToString()
	{
	var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
	Assert.AreEqual("{ \"foo\": \"bar\", \"x\": \"y\" }", map.ToString());
	}

	[Test]
	public void ToString_UnsupportedKeyType()
	{
	var map = new MapField<byte, string> { { 10, "foo" } };
	Assert.Throws<ArgumentException>(() => map.ToString());
	}

	private static KeyValuePair<TKey, TValue> NewKeyValuePair<TKey, TValue>(TKey key, TValue value)
	{
	return new KeyValuePair<TKey, TValue>(key, value);
	}
	}
	}