Make more tests async.

src/EditorFeatures/Test2/GoToDefinition/GoToDefinitionCommandHandlerTests.vb

@@ -19,20 +19,20 @@ Namespace Microsoft.CodeAnalysis.Editor.UnitTests.GoToDefinition
     Public Class GoToDefinitionCancellationTests
 
         <WpfFact, Trait(Traits.Feature, Traits.Features.GoToDefinition)>
-        Public Sub TestCancellation()
+        Public Async Function TestCancellation() As Tasks.Task
             ' Run without cancelling.
-            Dim updates As Integer = Me.Cancel(Integer.MaxValue, False)
+            Dim updates As Integer = Await Me.CancelAsync(Integer.MaxValue, False)
             Assert.InRange(updates, 0, Integer.MaxValue)
             Dim i As Integer = 0
             While i < updates
-                Dim n As Integer = Me.Cancel(i, True)
+                Dim n As Integer = Await Me.CancelAsync(i, True)
                 Assert.Equal(n, i + 1)
                 i = i + 1
             End While
-        End Sub
+        End Function
 
         <WpfFact, Trait(Traits.Feature, Traits.Features.GoToDefinition)>
-        Public Sub TestInLinkedFiles()
+        Public Async Function TestInLinkedFiles() As Tasks.Task
             Dim definition =
 <Workspace>
     <Project Language="C#" CommonReferences="true" AssemblyName="CSProj" PreprocessorSymbols="Proj1">
@@ -57,7 +57,7 @@ class C
     </Project>
 </Workspace>
 
-            Using workspace = TestWorkspaceFactory.CreateWorkspace(
+            Using workspace = Await TestWorkspaceFactory.CreateWorkspaceAsync(
                     definition,
                     exportProvider:=MinimalTestExportProvider.CreateExportProvider(GoToTestHelpers.Catalog.WithPart(GetType(CSharpGoToDefinitionService))))
 
@@ -79,9 +79,9 @@ class C
                 Assert.True(mockDocumentNavigationService._triedNavigationToSpan)
                 Assert.Equal(New TextSpan(121, 2), mockDocumentNavigationService._span)
             End Using
-        End Sub
+        End Function
 
-        Private Function Cancel(updatesBeforeCancel As Integer, expectedCancel As Boolean) As Integer
+        Private Async Function CancelAsync(updatesBeforeCancel As Integer, expectedCancel As Boolean) As Tasks.Task(Of Integer)
             Dim definition =
 <Workspace>
     <Project Language="C#" CommonReferences="true">
@@ -91,7 +91,7 @@ class C
     </Project>
 </Workspace>
 
-            Using workspace = TestWorkspaceFactory.CreateWorkspace(definition, exportProvider:=GoToTestHelpers.ExportProvider)
+            Using workspace = Await TestWorkspaceFactory.CreateWorkspaceAsync(definition, exportProvider:=GoToTestHelpers.ExportProvider)
                 Dim cursorDocument = workspace.Documents.First(Function(d) d.CursorPosition.HasValue)
                 Dim cursorPosition = cursorDocument.CursorPosition.Value