Fix nondeterministic test failures on CI

MonoDevelop.MSBuild.Editor/Completion/MSBuildCompletionSource.cs

@@ -56,10 +56,16 @@ protected override MSBuildCompletionContext CreateTriggerContext (IAsyncCompleti
 
 		protected override Task<IList<CompletionItem>> GetElementCompletionsAsync (MSBuildCompletionContext context, bool includeBracket, CancellationToken token)
 		{
+			if (EnableDebugTrace) {
+				LogTrace ($"Entered GetElementCompletionsAsync");
+			}
 			var doc = context.Document;
 
 			var nodePath = context.NodePath;
 			if (!CompletionHelpers.TryGetElementSyntaxForElementCompletion(nodePath, out MSBuildElementSyntax languageElement, out string elementName)) {
+				if (EnableDebugTrace) {
+					LogTrace ($"Exited GetElementCompletionsAsync with no syntax");
+				}
 				return TaskCompleted (null);
 			}
 
@@ -80,6 +86,9 @@ protected override Task<IList<CompletionItem>> GetElementCompletionsAsync (MSBui
 				items.Add (c);
 			}
 
+			if (EnableDebugTrace) {
+				LogTrace ($"Exited GetElementCompletionsAsync with {items.Count} items");
+			}
 			return TaskCompleted (items);
 		}
 

MonoDevelop.MSBuild.Tests.Editor/Completion/MSBuildCommitTests.cs

@@ -1,11 +1,9 @@
 // Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-using System;
+using System.Threading;
 using System.Threading.Tasks;
 
-using Microsoft.VisualStudio.Text.Editor.Commanding;
-
 using MonoDevelop.Xml.Editor.Tests.Extensions;
 
 using NUnit.Framework;
@@ -15,18 +13,26 @@ namespace MonoDevelop.MSBuild.Tests.Editor.Completion
 	[TestFixture]
 	public class MSBuildCommitTests : MSBuildEditorTest
 	{
-		Task TestTypeCommands (string filename, string before, string typeChars, string after)
+		async Task TestTypeCommands (string filename, string before, string typeChars, string after)
 		{
-			return this.TestCommands (
-				before,
-				after,
-				[ (s) => s.Type (typeChars) ],
-				filename: filename,
-				initialize: (tv) => {
-					tv.Options.SetOptionValue ("BraceCompletion/Enabled", true);
-					return Task.CompletedTask;
-				}
-			);
+			//CommandServiceExtensions.EnableDebugTrace = true;
+			//MSBuildCompletionSource.EnableDebugTrace = true;
+			//try {
+				await this.TestCommands (
+					before,
+					after,
+					EditorAction.Type (typeChars),
+					filename: filename,
+					initialize: async (tv) => {
+						tv.Options.SetOptionValue ("BraceCompletion/Enabled", true);
+						// ensure we have an initial parse before triggering completion
+						await Catalog.MSBuildParserProvider.GetParser (tv.TextBuffer).GetOrProcessAsync (tv.TextBuffer.CurrentSnapshot, CancellationToken.None);
+					}
+				);
+			//} finally {
+			//	CommandServiceExtensions.EnableDebugTrace = false;
+			//	MSBuildCompletionSource.EnableDebugTrace = false;
+			//}
 		}
 
 		[Test]

MonoDevelop.MSBuild.Tests.Editor/Refactorings/MSBuildEditorTestExtensions.cs

@@ -224,7 +224,13 @@ public static async Task TestCodeActionContext (
 			// the refactoring may have left multiple selections sp the user can e.g. type a new name for an extracted property
 			await test.Catalog.JoinableTaskContext.Factory.SwitchToMainThreadAsync (default);
 			var commandService = test.Catalog.CommandServiceFactory.GetService (ctx.TextView);
-			commandService.Type (typeText);
+
+			foreach(var editorAction in EditorAction.Type (typeText)) {
+				editorAction (commandService);
+				// yield to let things catch up
+				// and so we don't block the UI thread between the commands
+				await Task.Delay (20);
+			}
 
 			Assert.That (
 				ctx.TextBuffer.CurrentSnapshot.GetText (),