Fixed up test failures

src/Compilers/CSharp/Test/Emit/Attributes/InternalsVisibleToAndStrongNameTests.cs

@@ -1515,7 +1515,7 @@ public class C {}";
 
             var options = TestOptions.SigningReleaseModule.WithCryptoKeyContainer("roslynTestContainer");
 
-            var other = CreateCompilation(s, options: options);
+            var other = CreateCompilation(s, options: options, parseOptions: parseOptions);
 
             var outStrm = new MemoryStream();
             var success = other.Emit(outStrm);

src/Compilers/Core/Portable/Compilation.EmitStream.cs

@@ -97,9 +97,10 @@ private Stream CreateStream(DiagnosticBag diagnostics)
 
                     try
                     {
-                        Func<string, Stream> streamConstructor = path => new FileStream(path, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
+                        var fileSystem = _strongNameProvider.FileSystem;
+                        Func<string, Stream> streamConstructor = path => fileSystem.CreateFileStream(path, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
 
-                        var tempDir = _strongNameProvider.FileSystem.GetTempPath();
+                        var tempDir = fileSystem.GetTempPath();
                         var tempFilePath = Path.Combine(tempDir, Guid.NewGuid().ToString("N"));
                         var tempStream = FileUtilities.CreateFileStreamChecked(streamConstructor, tempFilePath);
 

src/Compilers/Core/Portable/StrongName/StrongNameFileSystem.cs

@@ -23,6 +23,11 @@ internal StrongNameFileSystem(string tempPath = null)
                 : () => tempPath;
         }
 
+        internal virtual FileStream CreateFileStream(string filePath, FileMode fileMode, FileAccess fileAccess, FileShare fileShare)
+        {
+            return new FileStream(filePath, fileMode, fileAccess, fileShare);
+        }
+
         internal virtual byte[] ReadAllBytes(string fullPath)
         {
             Debug.Assert(PathUtilities.IsAbsolute(fullPath));

src/Compilers/VisualBasic/Test/Emit/Attributes/EmitTestStrongNameProvider.vb

@@ -18,10 +18,12 @@ Partial Public Class InternalsVisibleToAndStrongNameTests
     Public Sub BadInputStream()
         SigningTestHelpers.InstallKey()
         Dim thrownException = New IOException("This is a test IOException")
-        Dim testProvider = New TestDesktopStrongNameProvider() With {
-            .SignFileFunc = Sub(a, b) Throw thrownException
+        Dim testFileSystem = New TestStrongNameFileSystem() With {
+            .CreateFileStreamFunc = Function(filePath As String, fileMode As FileMode, fileAccess As FileAccess, fileShare As FileShare) As FileStream
+                                        Throw thrownException
+                                    End Function
         }
-
+        Dim testProvider = New TestDesktopStrongNameProvider(fileSystem:=testFileSystem)
         Dim options = TestOptions.DebugDll.WithStrongNameProvider(testProvider).WithCryptoKeyContainer("RoslynTestContainer")
 
         Dim comp = CreateCompilationWithMscorlib40(

src/Test/Utilities/Portable/Compilation/TestStrongNameFileSystem.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.
 
 using System;
+using System.IO;
 
 namespace Microsoft.CodeAnalysis.Test.Utilities
 {
     internal sealed class TestStrongNameFileSystem : StrongNameFileSystem
     {
         internal Func<string, byte[]> ReadAllBytesFunc { get; set; }
+        internal Func<string, FileMode, FileAccess, FileShare, FileStream> CreateFileStreamFunc { get; set; }
 
         internal TestStrongNameFileSystem()
         {
             ReadAllBytesFunc = base.ReadAllBytes;
+            CreateFileStreamFunc = base.CreateFileStream;
         }
 
         internal override byte[] ReadAllBytes(string fullPath) => ReadAllBytesFunc(fullPath);
+        internal override FileStream CreateFileStream(string filePath, FileMode fileMode, FileAccess fileAccess, FileShare fileShare) =>
+            CreateFileStreamFunc(filePath, fileMode, fileAccess, fileShare);
     }
 }