Responding to PR feedback.

src/VisualStudio/IntegrationTests/CSharp/CSharpAutomaticBraceCompletion.cs

@@ -52,7 +52,7 @@ public async Task BracesInsertionAndTabCompleting()
             Assert.Equal("        if (true) { ", _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal("}", _editorWindow.CurrentLineTextAfterCursor);
 
-            await _editorWindow.TypeTextAsync("\t");
+            await _editorWindow.TypeTextAsync($"{EditorWindow.TAB}");
 
             Assert.Equal("        if (true) { }", _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal(string.Empty, _editorWindow.CurrentLineTextAfterCursor);
@@ -88,7 +88,8 @@ public async Task BracesOnReturnNoFormattingOnlyIndentationBeforeCloseBrace()
             _editorWindow.PlaceCursor("// Marker");
 
             await _editorWindow.TypeTextAsync("if (true) {");
-            await _editorWindow.TypeTextAsync("\nvar a = 1;");
+            await _editorWindow.TypeTextAsync($"{EditorWindow.ENTER}");
+            await _editorWindow.TypeTextAsync("var a = 1;");
 
             Assert.Equal("            var a = 1;", _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal(string.Empty, _editorWindow.CurrentLineTextAfterCursor);
@@ -106,7 +107,8 @@ public async Task BracesOnReturnOvertypingTheClosingBrace()
             _editorWindow.PlaceCursor("// Marker");
 
             await _editorWindow.TypeTextAsync("if (true) {");
-            await _editorWindow.TypeTextAsync("\nvar a = 1;}");
+            await _editorWindow.TypeTextAsync($"{EditorWindow.ENTER}");
+            await _editorWindow.TypeTextAsync("var a = 1;}");
 
             Assert.Equal("        }", _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal(string.Empty, _editorWindow.CurrentLineTextAfterCursor);
@@ -123,7 +125,9 @@ public async Task BracesOnReturnOvertypingTheClosingBrace()
         public async Task BracesOnReturnWithNonWhitespaceSpanInside()
         {
             _editorWindow.Text = string.Empty;
-            await _editorWindow.TypeTextAsync("class A { int i;\n");
+
+            await _editorWindow.TypeTextAsync("class A { int i;");
+            await _editorWindow.TypeTextAsync($"{EditorWindow.ENTER}");
 
             Assert.Equal(string.Empty, _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal("}", _editorWindow.CurrentLineTextAfterCursor);
@@ -146,7 +150,8 @@ public async Task ParenInsertionAndTabCompleting()
             Assert.Equal("    void Foo(", _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal(")", _editorWindow.CurrentLineTextAfterCursor);
 
-            await _editorWindow.TypeTextAsync("int x\t");
+            await _editorWindow.TypeTextAsync("int x");
+            await _editorWindow.TypeTextAsync($"{EditorWindow.TAB}");
 
             Assert.Equal("    void Foo(int x)", _editorWindow.CurrentLineTextBeforeCursor);
             Assert.Equal(string.Empty, _editorWindow.CurrentLineTextAfterCursor);
@@ -162,7 +167,7 @@ public async Task ParenOvertyping()
             _editorWindow.PlaceCursor("// Marker");
 
             await _editorWindow.TypeTextAsync("void Foo(");
-            await _editorWindow.TypeTextAsync("\u001B"); // ESC
+            await _editorWindow.TypeTextAsync($"{EditorWindow.ESC}");
             await _editorWindow.TypeTextAsync(")");
 
             Assert.Equal("    void Foo()", _editorWindow.CurrentLineTextBeforeCursor);

src/VisualStudio/TestUtilities/IntegrationHelper.cs

@@ -44,7 +44,7 @@ public static bool BlockInput()
             {
                 var hresult = Marshal.GetHRForLastWin32Error();
 
-                if (hresult == -2147024891) // E_ACCESS_DENIED
+                if (hresult == VSConstants.E_ACCESSDENIED)
                 {
                     Debug.WriteLine("Input cannot be blocked because the system requires Administrative privileges.");
                 }
@@ -140,7 +140,7 @@ public static object GetRegistryKeyValue(RegistryKey baseKey, string subKeyName,
             {
                 if (registryKey == null)
                 {
-                    throw new Exception($"The specified registry key could not be found. Registry Key: '{registryKey}'");
+                    throw new Exception($@"The specified registry key could not be found. Registry Key: '{baseKey}\{subKeyName}'");
                 }
 
                 return registryKey.GetValue(valueName);

src/VisualStudio/TestUtilities/Interop/Kernel32.cs

@@ -7,7 +7,6 @@ namespace Roslyn.VisualStudio.Test.Utilities.Interop
     internal static class Kernel32
     {
         [DllImport("Kernel32.dll", CallingConvention = CallingConvention.Winapi, EntryPoint = "GetCurrentThreadId", PreserveSig = true, SetLastError = false)]
-        public static extern uint GetCurrentThreadId(
-        );
+        public static extern uint GetCurrentThreadId();
     }
 }

src/VisualStudio/TestUtilities/Window/EditorWindow.cs

@@ -12,6 +12,52 @@ namespace Roslyn.VisualStudio.Test.Utilities
     /// <summary>Provides a means of interacting with the active editor window in the Visual Studio host.</summary>
     public class EditorWindow
     {
+        public const char ENTER = '\u000D';
+        public const char TAB = '\u0009';
+        public const char ESC = '\u001B';
+        public const char ESCAPE = '\u001B';
+        public const char HOME = '\u0024';
+        public const char END = '\u0023';
+        public const char LEFT = '\u0025';
+        public const char RIGHT = '\u0027';
+        public const char UP = '\u0026';
+        public const char DOWN = '\u0028';
+        public const char PGUP = '\u0021';
+        public const char PGDN = '\u0022';
+        public const char NUMLOCK = '\u0090';
+        public const char SCROLLLOCK = '\u0091';
+        public const char PRTSC = '\u002C';
+        public const char BREAK = '\u0003';
+        public const char BACKSPACE = '\u0008';
+        public const char BKSP = '\u0008';
+        public const char BS = '\u0008';
+        public const char CLEAR = '\u000C';
+        public const char CAPSLOCK = '\u0014';
+        public const char INSERT = '\u002D';
+        public const char DEL = '\u002E';
+        public const char DELETE = '\u002E';
+        public const char HELP = '\u002F';
+        public const char F1 = '\u0070';
+        public const char F2 = '\u0071';
+        public const char F3 = '\u0072';
+        public const char F4 = '\u0073';
+        public const char F5 = '\u0074';
+        public const char F6 = '\u0075';
+        public const char F7 = '\u0076';
+        public const char F8 = '\u0077';
+        public const char F9 = '\u0078';
+        public const char F10 = '\u0079';
+        public const char F11 = '\u007A';
+        public const char F12 = '\u007B';
+        public const char F13 = '\u007C';
+        public const char F14 = '\u007D';
+        public const char F15 = '\u007E';
+        public const char F16 = '\u007F';
+        public const char MULTIPLY = '\u006A';
+        public const char ADD = '\u006B';
+        public const char SUBTRACT = '\u006D';
+        public const char DIVIDE = '\u006F';
+
         private readonly VisualStudioInstance _visualStudioInstance;
         private readonly EditorWindowWrapper _editorWindowWrapper;