Implement PathCodeFix

Author: inyutin-maxim

System.IO.Abstractions.Analyzers.Tests/CodeFixes/PathCodeFixTests.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.IO.Abstractions.Analyzers.Analyzers.FileSystemTypeAnalyzers;
+using System.IO.Abstractions.Analyzers.CodeFixes;
+using Microsoft.CodeAnalysis;
+using Roslyn.Testing.CodeFix;
+using Xunit;
+
+namespace System.IO.Abstractions.Analyzers.Tests.CodeFixes
+{
+	public class PathCodeFixTests :
+		CSharpCodeFixProviderTest<PathAnalyzer, PathCodeFix>
+	{
+		[Theory]
+		[InlineData("BeforeFix.txt", "AfterFix.txt")]
+		public void CodeFix(string sourceBefore, string sourceAfter)
+		{
+			var sourceBeforeFix = ReadFile(sourceBefore);
+			var sourceAfterFix = ReadFile(sourceAfter);
+			VerifyFix(sourceBeforeFix, sourceAfterFix, 0, true);
+		}
+
+		protected override IEnumerable<MetadataReference> GetAdditionalReferences() => new[]
+		{
+			MetadataReference.CreateFromFile(typeof(IFileSystem).Assembly.Location)
+		};
+	}
+}

System.IO.Abstractions.Analyzers.Tests/TestData/CodeFix/PathCodeFix/AfterFix.txt

@@ -0,0 +1,21 @@
+using System.IO.Abstractions;
+
+namespace SomeNameSpace
+{
+	public class WithOutFileSystem
+	{
+		private readonly IFileSystem _fileSystem;
+
+		public WithOutFileSystem(IFileSystem fileSystem)
+		{
+			_fileSystem = fileSystem;
+		}
+
+		public void SomeMethod()
+		{
+			const string filePath = "C:\\temp.txt";
+
+			_fileSystem.Path.Exists(filePath);
+		}
+	}
+}

System.IO.Abstractions.Analyzers.Tests/TestData/CodeFix/PathCodeFix/BeforeFix.txt

@@ -0,0 +1,21 @@
+using System.IO.Abstractions;
+
+namespace SomeNameSpace
+{
+	public class WithOutFileSystem
+	{
+		private readonly IFileSystem _fileSystem;
+
+		public WithOutFileSystem(IFileSystem fileSystem)
+		{
+			_fileSystem = fileSystem;
+		}
+
+		public void SomeMethod()
+		{
+			const string filePath = "C:\\temp.txt";
+
+			Path.Exists(filePath);
+		}
+	}
+}

System.IO.Abstractions.Analyzers/Analyzers/FileSystemTypeAnalyzers/PathAnalyzer.cs

@@ -13,7 +13,7 @@ public class PathAnalyzer : BaseFileSystemNodeAnalyzer
 		/// Diagnostic Identifier
 		/// </summary>
 		[UsedImplicitly]
-		public const string DiagnosticId = "IO0006";
+		public const string DiagnosticId = Constants.Io0006;
 
 		/// <summary>
 		/// Diagnostic Title

System.IO.Abstractions.Analyzers/CodeFixes/PathCodeFix.cs

@@ -0,0 +1,15 @@
+using System.Composition;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CodeFixes;
+
+namespace System.IO.Abstractions.Analyzers.CodeFixes
+{
+	[Shared]
+	[ExportCodeFixProvider(LanguageNames.CSharp, Name = nameof(PathCodeFix))]
+	public class PathCodeFix: BaseInvokeCodeFix
+	{
+		protected override string DiagnosticId => Constants.Io0006;
+
+		protected override string Title => "Use IFileSystem.Path for improved testablity";
+	}
+}

System.IO.Abstractions.Analyzers/Constants.cs

@@ -17,5 +17,11 @@ public static class Constants
 		public const string Io0001 = "IO0001";
 
 		public const string Io0002 = "IO0002";
+
+		public const string Io0003 = "IO0003";
+
+		public const string Io0004 = "IO0004";
+		public const string Io0005 = "IO0005";
+		public const string Io0006 = "IO0006";
 	}
 }