Fix issue#685

Author: maoyiz

sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/statistic/metric/OccupiableBucketLeapArrayTest.java

@@ -6,6 +6,7 @@
 import com.alibaba.csp.sentinel.slots.statistic.base.WindowWrap;
 import com.alibaba.csp.sentinel.slots.statistic.data.MetricBucket;
 import com.alibaba.csp.sentinel.slots.statistic.metric.occupy.OccupiableBucketLeapArray;
+import com.alibaba.csp.sentinel.test.AbstractTimeBasedTest;
 import com.alibaba.csp.sentinel.util.TimeUtil;
 
 import org.junit.Test;
@@ -17,7 +18,7 @@
  *
  * @author jialiang.linjl
  */
-public class OccupiableBucketLeapArrayTest {
+public class OccupiableBucketLeapArrayTest extends AbstractTimeBasedTest {
 
     private final int windowLengthInMs = 200;
     private final int intervalInSec = 2;
@@ -122,6 +123,14 @@ public void testWindowAfterOneInterval() {
             sum += bucket.pass();
         }
         assertEquals(sum, 2 * intervalInSec * 1000 / windowLengthInMs - 1);
+
+        /**
+         * https://github.com/alibaba/Sentinel/issues/685
+         *
+         * Here we could not use exactly current time, because the following result is related with the above elapse.
+         * So we use the beginning current time to ensure.
+         */
+        setCurrentMillis(currentTime);
         assertEquals(leapArray.currentWaiting(), 10);
     }
 }