Clear tests

test/SkyWalking.Core.Tests/UnitTest1.cs

-using System;
-using System.Threading.Tasks;
-using SkyWalking.Boot;
-using SkyWalking.Config;
-using SkyWalking.Context;
-using SkyWalking.Context.Trace;
-using SkyWalking.Remote;
-using Xunit;
-
-namespace SkyWalking.Core.Tests
-{
-    public class UnitTest1
-    {
-        [Fact]
-        public async Task Test1()
-        {
-            AgentConfig.ApplicationCode = "skywalking.test";
-            CollectorConfig.DirectServers = "localhost:11800";
-            await GrpcChannelManager.Instance.ConnectAsync();
-            await ServiceManager.Instance.Initialize();
-            var appId = RemoteDownstreamConfig.Agent.ApplicationId;
-            var appInsId = RemoteDownstreamConfig.Agent.ApplicationInstanceId;
-
-            var span = ContextManager.CreateEntrySpan("test", new ContextCarrier());
-
-            span.SetComponent("Skywalking.Core.Tests");
-            
-            span.AsHttp();
-            
-            ContextManager.StopSpan(span);
-            
-            
-        }
-    }
-}