Fixed memory leak due to O containers request cancellation

Author: ASHISH-RANJAN59

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/scheduler/TestOpportunisticContainerContext.java

@@ -142,7 +142,7 @@ public void testAddToOutstandingReqsWithZeroContainerAndNullCapability() {
     public void testAddToOutstandingReqsWithEmptyReqMap() {
         ResourceRequest request = getResourceRequest("resource", 0);
         Mockito.doReturn(new TreeMap<>())
-                .when(opportunisticContainerContext).getContainerIdGenerator();
+                .when(opportunisticContainerContext).getOutstandingOpReqs();
         List<ResourceRequest> resourceRequestList = new ArrayList<>();
         resourceRequestList.add(request);
         opportunisticContainerContext.addToOutstandingReqs(resourceRequestList);