Enable skipped tests

src/Scripting/CSharpTest.Desktop/CsiTests.cs

-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 extern alias PortableTestUtils;
 
 using System;
+using System.Reflection;
 using Roslyn.Test.Utilities;
 using Roslyn.Utilities;
 using Xunit;
-using TestBase = PortableTestUtils::Roslyn.Test.Utilities.TestBase;
 using AssertEx = PortableTestUtils::Roslyn.Test.Utilities.AssertEx;
+using TestBase = PortableTestUtils::Roslyn.Test.Utilities.TestBase;
 
 namespace Microsoft.CodeAnalysis.CSharp.Scripting.Hosting.UnitTests
 {
     public class CsiTests : TestBase
     {
-        private string CsiPath => typeof(Csi).Assembly.Location;
+        private static readonly string CompilerVersion = typeof(Csi).GetTypeInfo().Assembly.GetCustomAttribute<AssemblyFileVersionAttribute>().Version;
+        private string CsiPath => typeof(Csi).GetTypeInfo().Assembly.Location;
 
         /// <summary>
         /// csi should use the current working directory of its environment to resolve relative paths specified on command line.
@@ -29,7 +31,7 @@ public void CurrentWorkingDirectory1()
             Assert.False(result.ContainsErrors);
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/6523")]
+        [Fact]
         public void CurrentWorkingDirectory_Change()
         {
             var dir = Temp.CreateDirectory();
@@ -47,15 +49,15 @@ public void CurrentWorkingDirectory_Change()
 Environment.Exit(0)
 ");
 
-            AssertEx.AssertEqualToleratingWhitespaceDifferences(@"
-Microsoft (R) Visual C# Interactive Compiler version 42.42.42.42
+            AssertEx.AssertEqualToleratingWhitespaceDifferences($@"
+Microsoft (R) Visual C# Interactive Compiler version {CompilerVersion}
 Copyright (C) Microsoft Corporation. All rights reserved.
 
 Type ""#help"" for more information.
 > (1,7): error CS1504: Source file 'a.csx' could not be opened -- Could not find file.
 > (1,1): error CS0006: Metadata file 'C.dll' could not be found
 > > > > 1
-> C { }
+> C {{ }}
 > 
 ", result.Output);
 

src/Scripting/CSharpTest/CommandLineRunnerTests.cs

@@ -458,7 +458,7 @@ public void ReferenceSearchPaths1()
 ", runner.Console.Out.ToString());
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/6523")]
+        [Fact]
         public void SourceSearchPaths_Change1()
         {
             var dir = Temp.CreateDirectory();
@@ -475,7 +475,7 @@ public void SourceSearchPaths_Change1()
             runner.RunInteractive();
 
             AssertEx.AssertEqualToleratingWhitespaceDifferences($@"
-Microsoft (R) Visual C# Interactive Compiler version 42.42.42.42
+Microsoft (R) Visual C# Interactive Compiler version {CompilerVersion}
 Copyright (C) Microsoft Corporation. All rights reserved.
 
 Type ""#help"" for more information.
@@ -493,7 +493,7 @@ > X
 ", runner.Console.Out.ToString());
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/6523")]
+        [Fact]
         public void ReferenceSearchPaths_Change1()
         {
             var dir = Temp.CreateDirectory();
@@ -510,7 +510,7 @@ public void ReferenceSearchPaths_Change1()
             runner.RunInteractive();
 
             AssertEx.AssertEqualToleratingWhitespaceDifferences($@"
-Microsoft (R) Visual C# Interactive Compiler version 42.42.42.42
+Microsoft (R) Visual C# Interactive Compiler version {CompilerVersion}
 Copyright (C) Microsoft Corporation. All rights reserved.
 
 Type ""#help"" for more information.