Rewrite SignatureHelpItemsContainsAll as AssertSignatureHelpItemsContainAll

src/EditorFeatures/Test2/IntelliSense/VisualBasicCompletionCommandHandlerTests.vb

@@ -1208,7 +1208,7 @@ End Class
                 state.SendTypeChars("(")
                 Await state.AssertSignatureHelpSession()
                 Await state.WaitForAsynchronousOperationsAsync()
-                Assert.True(state.SignatureHelpItemsContainsAll({"Object.Finalize()"}))
+                state.AssertSignatureHelpItemsContainAll({"Object.Finalize()"})
             End Using
         End Function
 

src/EditorFeatures/TestUtilities2/Intellisense/TestStateBase.vb

@@ -281,11 +281,11 @@ Namespace Microsoft.CodeAnalysis.Editor.UnitTests.IntelliSense
             Return CurrentSignatureHelpPresenterSession.SignatureHelpItems
         End Function
 
-        Public Function SignatureHelpItemsContainsAll(displayText As String()) As Boolean
+        Public Sub AssertSignatureHelpItemsContainAll(displayText As String())
             AssertNoAsynchronousOperationsRunning()
-            Return displayText.All(Function(v) CurrentSignatureHelpPresenterSession.SignatureHelpItems.Any(
-                                       Function(i) GetDisplayText(i, CurrentSignatureHelpPresenterSession.SelectedParameter.Value) = v))
-        End Function
+            Assert.True(displayText.All(Function(v) CurrentSignatureHelpPresenterSession.SignatureHelpItems.Any(
+                                            Function(i) GetDisplayText(i, CurrentSignatureHelpPresenterSession.SelectedParameter.Value) = v)))
+        End Sub
 
         Public Async Function AssertSelectedSignatureHelpItem(Optional displayText As String = Nothing,
                                Optional documentation As String = Nothing,