Remove blocking calls from tests.

src/EditorFeatures/CSharpTest/ExtractInterface/ExtractInterfaceTests.cs

@@ -1010,7 +1010,7 @@ class Program $$: ISomeInterface<object>
         {
             using (var testState = await ExtractInterfaceTestState.CreateAsync(markup, LanguageNames.CSharp, compilationOptions: null))
             {
-                var result = testState.GetTypeAnalysisResult(typeDiscoveryRule);
+                var result = await testState.GetTypeAnalysisResultAsync(typeDiscoveryRule);
                 Assert.Equal(expectedExtractable, result.CanExtractInterface);
             }
         }

src/EditorFeatures/Test/ExtractInterface/ExtractInterfaceTestState.cs

@@ -67,13 +67,13 @@ public TestExtractInterfaceOptionsService TestExtractInterfaceOptionsService
             }
         }
 
-        public ExtractInterfaceTypeAnalysisResult GetTypeAnalysisResult(TypeDiscoveryRule typeDiscoveryRule)
+        public Task<ExtractInterfaceTypeAnalysisResult> GetTypeAnalysisResultAsync(TypeDiscoveryRule typeDiscoveryRule)
         {
             return ExtractInterfaceService.AnalyzeTypeAtPositionAsync(
                 ExtractFromDocument,
                 _testDocument.CursorPosition.Value,
                 typeDiscoveryRule,
-                CancellationToken.None).WaitAndGetResult(CancellationToken.None);
+                CancellationToken.None);
         }
 
         public ExtractInterfaceResult ExtractViaCommand()

src/EditorFeatures/Test/RenameTracking/RenameTrackingTestState.cs

@@ -195,11 +195,7 @@ public async Task AssertTag(string expectedFromName, string expectedToName, bool
 
             if (invokeAction)
             {
-                var operations = actions[0]
-                    .GetOperationsAsync(CancellationToken.None)
-                    .WaitAndGetResult(CancellationToken.None)
-                    .ToArray();
-
+                var operations = (await actions[0].GetOperationsAsync(CancellationToken.None)).ToArray();
                 Assert.Equal(1, operations.Length);
 
                 operations[0].Apply(this.Workspace, CancellationToken.None);