linux-packaging-mono/mcs/class/corlib/Test/System/NullableTest.cs

//
// NullableTest.cs
//
// Authors:
//	Marek Safar  <marek.safar@gmail.com>
//
// Copyright (C) 2014 Xamarin Inc (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using NUnit.Framework;

namespace MonoTests.System
{
	[TestFixture]
	public class NullableTest
	{
		[Test]
		public void GetUnderlyingType ()
		{
			Assert.AreSame (typeof (int), Nullable.GetUnderlyingType (typeof (Nullable<int>)), "#1");
			Assert.IsNull (Nullable.GetUnderlyingType (typeof (Nullable<>)), "#2");
		}

		private struct MutatingStruct
		{
			public int Value;
			public override bool Equals(object obj) => Value++.Equals(null);
		}

		[Test]
		public void EqualsImpl ()
		{
			MutatingStruct? ms = new MutatingStruct () { Value = 1 };
			ms.Equals (new object ());
			Assert.AreEqual (ms.Value.Value, 2, "#1");
		}
	}
}