Reset TextReplacement.FileSystem in tests also.

Throw custom exception to investigate projguid method parameters on build server.

Author: Zubin Ramlakhan

CodeConverter/Shared/SolutionFileTextEditor.cs

@@ -84,8 +84,14 @@ private static (string oldProjTypeReference, string newProjTypeReference) GetPro
         private static (string Find, string Replace, bool FirstOnly) GetProjectGuidReplacement(string projPath,
             string contents)
         {
-            var projGuidRegex = new Regex(projPath + @""", ""({[0-9A-Fa-f\-]{32,36}})("")");
+            var guidPattern = projPath + @""", ""({[0-9A-Fa-f\-]{32,36}})("")";
+            var projGuidRegex = new Regex(guidPattern);
             var projGuidMatch = projGuidRegex.Match(contents);
+
+            if (!projGuidMatch.Success) {
+                throw new OperationCanceledException($"{nameof(guidPattern)} {guidPattern} doesn't match with sourceSlnFileContents {contents}");
+            }
+
             var oldGuid = projGuidMatch.Groups[1].Value;
             var newGuid = GetDeterministicGuidFrom(new Guid(oldGuid));
             return (oldGuid, newGuid.ToString("B").ToUpperInvariant(), false);

Tests/CSharp/MultiFileSolutionAndProjectTests.cs

@@ -17,16 +17,14 @@ public MultiFileSolutionAndProjectTests(MultiFileTestFixture multiFileTestFixtur
             _multiFileTestFixture = multiFileTestFixture;
         }
 
-        //[Fact] /* enable for executing locally */
-        [Fact(Skip = "Doesn't work on Github actions agent")] /* disable for executing locally */
+        [Fact] /* enable for executing locally */
         public async Task ConvertWholeSolutionAsync()
         {
 
             await _multiFileTestFixture.ConvertProjectsWhereAsync(p => true, Language.CS);
         }
 
-        //[Fact] /* enable for executing locally */
-        [Fact(Skip = "Doesn't work on Github actions agent")]  /* disable for executing locally */
+        [Fact] /* enable for executing locally */
         public async Task ConvertVbLibraryOnlyAsync()
         {
             await _multiFileTestFixture.ConvertProjectsWhereAsync(p => p.Name == "VbLibrary", Language.CS);

Tests/LanguageAgnostic/SolutionFileTextEditorTests.cs

@@ -32,6 +32,7 @@ public void Dispose()
             _sln = null;
             _fsMock.Reset();
             SolutionConverter.FileSystem = new FileSystem();
+            TextReplacementConverter.FileSystem = new FileSystem();
         }
 
         [Fact]

Tests/VB/MultiFileSolutionAndProjectTests.cs

@@ -17,15 +17,13 @@ public MultiFileSolutionAndProjectTests(MultiFileTestFixture multiFileTestFixtur
             _multiFileTestFixture = multiFileTestFixture;
         }
 
-        //[Fact] /* enable for executing locally */
-        [Fact(Skip = "Doesn't work on Github actions agent")]  /* disable for executing locally */
+        [Fact] /* enable for executing locally */
         public async Task ConvertWholeSolutionAsync()
         {
             await _multiFileTestFixture.ConvertProjectsWhereAsync(p => true, Language.VB);
         }
 
-        //[Fact] /* enable for executing locally */
-        [Fact(Skip = "Doesn't work on Github actions agent")]  /* disable for executing locally */
+        [Fact] /* enable for executing locally */
         public async Task ConvertCSharpConsoleAppOnlyAsync()
         {
             await _multiFileTestFixture.ConvertProjectsWhereAsync(p => p.Name == "CSharpConsoleApp", Language.VB);