test: 精简命名空间

Author: ArgoZhang

test/UnitTest/Services/ThrottleTest.cs

@@ -3,8 +3,6 @@
 // See the LICENSE file in the project root for more information.
 // Maintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone
 
-using System.Runtime.InteropServices;
-
 namespace UnitTest.Services;
 
 public class ThrottleTest : BootstrapBlazorTestBase