Additional diagnostics for CommitOnSave failures

src/VisualStudio/IntegrationTest/IntegrationTests/VisualBasic/BasicLineCommit.cs

@@ -2,13 +2,13 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Test.Utilities;
 using Microsoft.VisualStudio.IntegrationTest.Utilities;
 using Microsoft.VisualStudio.IntegrationTest.Utilities.Input;
 using Roslyn.Test.Utilities;
 using Xunit;
-using Xunit.Abstractions;
 using ProjName = Microsoft.VisualStudio.IntegrationTest.Utilities.Common.ProjectUtils.Project;
 
 namespace Roslyn.VisualStudio.IntegrationTests.VisualBasic
@@ -92,8 +92,16 @@ End Module
             VisualStudio.Editor.SendKeys("x   as   integer", VirtualKey.Tab);
             VisualStudio.Editor.Verify.IsNotSaved();
             VisualStudio.Editor.SendKeys(new KeyPress(VirtualKey.S, ShiftState.Ctrl));
-            VisualStudio.Editor.Verify.IsSaved();
-            VisualStudio.Editor.Verify.TextContains(@"Sub Main(x As Integer)");
+            var savedFileName = VisualStudio.Editor.Verify.IsSaved();
+            try
+            {
+                VisualStudio.Editor.Verify.TextContains(@"Sub Main(x As Integer)");
+            }
+            catch (Exception e)
+            {
+                throw new InvalidOperationException($"Unexpected failure after saving document '{savedFileName}'", e);
+            }
+
             VisualStudio.ExecuteCommand(WellKnownCommandNames.Edit_Undo);
             VisualStudio.Editor.Verify.TextContains(@"Sub Main(x   As   Integer)");
             VisualStudio.Editor.Verify.CaretPosition(45);

src/VisualStudio/IntegrationTest/TestUtilities/InProcess/Editor_InProc.cs

@@ -145,9 +145,11 @@ public void VerifyNotSaved()
             Contract.ThrowIfTrue(GetDTE().ActiveDocument.ProjectItem.Saved);
         }
 
-        public void VerifySaved()
+        public string VerifySaved()
         {
-            Contract.ThrowIfFalse(GetDTE().ActiveDocument.ProjectItem.Saved);
+            var activeDocument = GetDTE().ActiveDocument;
+            Contract.ThrowIfFalse(activeDocument.ProjectItem.Saved);
+            return activeDocument.FullName;
         }
 
         public string GetActiveBufferName()

src/VisualStudio/IntegrationTest/TestUtilities/OutOfProcess/Editor_OutOfProc.Verifier.cs

@@ -26,9 +26,9 @@ public void IsNotSaved()
                 _textViewWindow._editorInProc.VerifyNotSaved();
             }
 
-            public void IsSaved()
+            public string IsSaved()
             {
-                _textViewWindow._editorInProc.VerifySaved();
+                return _textViewWindow._editorInProc.VerifySaved();
             }
 
             public void CurrentLineText(