Delete db.links before test

Author: FreePhoenix888

csharp/Platform.Data.Doublets.Tests/ILinksBasicTests.cs

@@ -1,8 +1,9 @@
-using System;
+
+using System.IO;
 using Platform.Data.Doublets.Memory.United.Generic;
 using Platform.Memory;
 using Xunit;
-using Xunit.Abstractions;
+
 
 namespace Platform.Data.Doublets.Tests
 {
@@ -32,7 +33,7 @@ public static void DeleteAllUsages()
         [Fact]
         public static void FfiDeleteAllUsages()
         {
-            var mem = new HeapResizableDirectMemory();
+            File.Delete("db.links");
             var links = new FFI.UnitedMemoryLinks<uint>("db.links");
 
             var root = links.CreatePoint();