fixed testcase

src/test/java/com/alibaba/druid/bvt/proxy/AllStatisticTest.java

@@ -26,9 +26,11 @@ import java.util.concurrent.atomic.AtomicLong;
 
 import javax.management.openmbean.TabularData;
 
-import junit.framework.Assert;
 import junit.framework.TestCase;
 
+import org.junit.Assert;
+
+import com.alibaba.druid.proxy.DruidDriver;
 import com.alibaba.druid.stat.JdbcStatManager;
 import com.alibaba.druid.util.JdbcUtils;
 
@@ -64,6 +66,8 @@ public class AllStatisticTest extends TestCase {
 
     protected void tearDown() throws Exception {
         JdbcUtils.close(globalConnection);
+        DruidDriver.getProxyDataSources().clear();
+        Assert.assertEquals(0, JdbcStatManager.getInstance().getSqlList().size());
     }
 
     public void test_stmt() throws Exception {