fix other ut

Change-Id: Ib1441354aba3c45b09a72881692812a1f267b2af

Author: uuuyuqi

sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/block/flow/FlowPartialIntegrationTest.java

@@ -18,6 +18,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.concurrent.CountDownLatch;
 
 import org.junit.After;
 import org.junit.Before;
@@ -78,18 +79,15 @@ public void testThreadGrade() throws InterruptedException, BlockException {
         flowRule.setCount(1);
         FlowRuleManager.loadRules(Arrays.asList(flowRule));
 
-        final Object sequence = new Object();
+        final CountDownLatch latch = new CountDownLatch(1);
 
         Runnable runnable = new Runnable() {
             @Override
             public void run() {
                 Entry e = null;
                 try {
                     e = SphU.entry("testThreadGrade");
-                    synchronized (sequence) {
-                        System.out.println("notify up");
-                        sequence.notify();
-                    }
+                    latch.countDown();
                     Thread.sleep(100);
                 } catch (BlockException e1) {
                     fail("Should had failed");
@@ -103,11 +101,7 @@ public void run() {
         Thread thread = new Thread(runnable);
         thread.start();
 
-        synchronized (sequence) {
-            System.out.println("sleep");
-            sequence.wait();
-            System.out.println("wake up");
-        }
+        latch.await();
 
         SphU.entry("testThreadGrade");
         System.out.println("done");