SharpDevelop/ICSharpCode.NRefactory.Tests/CSharp/CodeIssues/RedundantNullCheckTests.cs

// 
// RedundantNullCheckTests.cs
//  
// Author:
//       Ji Kun <jikun.nus@gmail.com>
// 
// Copyright (c) 2013 Ji Kun
// 
// 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;
using ICSharpCode.NRefactory.CSharp.Refactoring;
using ICSharpCode.NRefactory.CSharp.CodeActions;

namespace ICSharpCode.NRefactory.CSharp.CodeIssues
{
	[TestFixture]
	public class RedundantNullCheckTests : InspectionActionTestBase
	{
		[Test]
		public void TestInspectorCase1()
		{
			var input = @"using System;class Test {public void test(){int a = 0;if(a is int && a != null){a = 1;}}}";

			TestRefactoringContext context;
			var issues = GetIssues(new RedundantNullCheckIssue(), input, out context);
			Assert.AreEqual(1, issues.Count);

			
			CheckFix(context, issues, @"using System;class Test {public void test(){int a = 0;
		if (a is int) {
			a = 1;
		}}}");
		}

		[Test]
		public void TestResharperDisable()
		{
			var input = @"using System;
class Test {
	public void test(){
	int a = 0;
	//Resharper disable RedundantNullCheck
	if(a is int && a != null)
	{a = 1;}
	//Resharper restore RedundantNullCheck
	}	
	}";
			
			TestRefactoringContext context;
			var issues = GetIssues(new RedundantNullCheckIssue(), input, out context);
			Assert.AreEqual(0, issues.Count);
		}

		[Test]
		public void TestInspectorCase2()
		{
			var input = @"using System;class Test {public void test(){int a = 0;while(a != null && a is int){a = 1;}}}";

			TestRefactoringContext context;
			var issues = GetIssues(new RedundantNullCheckIssue(), input, out context);
			Assert.AreEqual(1, issues.Count);
			CheckFix(context, issues, @"using System;class Test {public void test(){int a = 0;
		while (a is int) {
			a = 1;
		}}}");
		}

		[Ignore("Missing")]
		[Test]
		public void TestCaseWithFullParens()
		{
			var input = 
				@"using System;
class TestClass
{
	public void Test(object o)
	{
		if (!((o is int) && (o != null))) {
		}
	}
}";

			TestRefactoringContext context;
			var issues = GetIssues(new RedundantNullCheckIssue(), input, out context);
			Assert.AreEqual(1, issues.Count);
			CheckFix(context, issues, @"using System;
class TestClass
{
	public void Test(object o)
	{
		if (!(o is int)) {
		}
	}
}");
		}

		[Ignore("Extended version")]
		[Test]
		public void TestNegatedCase()
		{
			var input = 
				@"using System;
class TestClass
{
	public void Test(object o)
	{
		if (null == o || !(o is int)) {
		}
	}
}";

			TestRefactoringContext context;
			var issues = GetIssues(new RedundantNullCheckIssue(), input, out context);
			Assert.AreEqual(1, issues.Count);
			CheckFix(context, issues, @"using System;
class TestClass
{
	public void Test(object o)
	{
		if (!(o is int)) {
		}
	}
}");
		}
	}
}