upgrade to 4.0.2

Author: yuqian.wjm

sofa-tracer-plugins/sofa-tracer-dubbo-2.6.x-plugin/src/test/java/com/alipay/sofa/tracer/plugins/dubbo/DubboSofaTracerTest.java

@@ -19,22 +19,15 @@
 import com.alibaba.dubbo.common.URL;
 import com.alibaba.dubbo.config.ApplicationConfig;
 import com.alibaba.dubbo.config.ProtocolConfig;
-import com.alibaba.dubbo.config.ReferenceConfig;
 import com.alibaba.dubbo.config.RegistryConfig;
 import com.alibaba.dubbo.config.ServiceConfig;
-import com.alibaba.dubbo.rpc.RpcContext;
-import com.alibaba.fastjson.JSON;
-import com.alibaba.fastjson.JSONObject;
 import com.alipay.common.tracer.core.configuration.SofaTracerConfiguration;
-import com.alipay.common.tracer.core.span.CommonSpanTags;
 import com.alipay.sofa.tracer.plugins.dubbo.enums.DubboLogEnum;
 import com.alipay.sofa.tracer.plugins.dubbo.impl.DubboServiceImpl;
 import com.alipay.sofa.tracer.plugins.dubbo.service.DubboService;
-import org.apache.commons.io.FileUtils;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
-import org.junit.Test;
 
 import java.io.File;
 import java.util.List;