Make tests async.

src/EditorFeatures/CSharpTest/Diagnostics/DiagnosticAnalyzerDriver/DiagnosticAnalyzerDriverTests.cs

@@ -90,7 +90,7 @@ class C
         public async Task DiagnosticAnalyzerDriverIsSafeAgainstAnalyzerExceptions()
         {
             var source = TestResource.AllInOneCSharpCode;
-            using (var workspace = CSharpWorkspaceFactory.CreateWorkspaceFromFile(source, TestOptions.Regular))
+            using (var workspace = await CSharpWorkspaceFactory.CreateWorkspaceFromFileAsync(source, TestOptions.Regular))
             {
                 var document = workspace.CurrentSolution.Projects.Single().Documents.Single();
                 await ThrowingDiagnosticAnalyzer<SyntaxKind>.VerifyAnalyzerEngineIsSafeAgainstExceptionsAsync(async analyzer =>

src/EditorFeatures/CSharpTest/Diagnostics/Suppression/SuppressionTests.cs

@@ -186,12 +186,10 @@ void Method()
 
                         TextSpan span;
                         var document = GetDocumentAndSelectSpan(workspace, out span);
-                        var diagnostics = diagnosticService.GetDiagnosticsForSpanAsync(document, span)
-                            .WaitAndGetResult(CancellationToken.None);
+                        var diagnostics = await diagnosticService.GetDiagnosticsForSpanAsync(document, span);
                         Assert.Equal(2, diagnostics.Where(d => d.Id == "CS0219").Count());
 
-                        var allFixes = fixService.GetFixesAsync(document, span, includeSuppressionFixes: true, cancellationToken: CancellationToken.None)
-                            .WaitAndGetResult(CancellationToken.None)
+                        var allFixes = (await fixService.GetFixesAsync(document, span, includeSuppressionFixes: true, cancellationToken: CancellationToken.None))
                             .SelectMany(fixCollection => fixCollection.Fixes);
 
                         var cs0219Fixes = allFixes.Where(fix => fix.PrimaryDiagnostic.Id == "CS0219");

src/EditorFeatures/VisualBasicTest/Diagnostics/DiagnosticAnalyzerDriver/DiagnosticAnalyzerDriverTests.vb

@@ -63,7 +63,7 @@ End Class
     <WorkItem(759)>
     Public Async Function DiagnosticAnalyzerDriverIsSafeAgainstAnalyzerExceptions() As Task
         Dim source = TestResource.AllInOneVisualBasicCode
-        Using Workspace = VisualBasicWorkspaceFactory.CreateWorkspaceFromFile(source)
+        Using Workspace = Await VisualBasicWorkspaceFactory.CreateWorkspaceFromFileAsync(source)
             Dim document = Workspace.CurrentSolution.Projects.Single().Documents.Single()
             Await ThrowingDiagnosticAnalyzer(Of SyntaxKind).VerifyAnalyzerEngineIsSafeAgainstExceptionsAsync(
                 Async Function(analyzer) Await DiagnosticProviderTestUtilities.GetAllDiagnosticsAsync(analyzer, document, New TextSpan(0, document.GetTextAsync().Result.Length), logAnalyzerExceptionAsDiagnostics:=True))