YARN-11253. Add Junit Test.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestClientRMTokens.java

@@ -124,9 +124,12 @@ public void testDelegationToken() throws Exception {
     long initialInterval = 10000l;
     long maxLifetime= 20000l;
     long renewInterval = 10000l;
+    long delegationTokenRemoverScanInterval =
+        conf.getLong(YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_KEY,
+            YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_DEFAULT);
 
     RMDelegationTokenSecretManager rmDtSecretManager = createRMDelegationTokenSecretManager(
-        initialInterval, maxLifetime, renewInterval);
+        initialInterval, maxLifetime, renewInterval, delegationTokenRemoverScanInterval);
     rmDtSecretManager.startThreads();
     LOG.info("Creating DelegationTokenSecretManager with initialInterval: "
         + initialInterval + ", maxLifetime: " + maxLifetime
@@ -574,7 +577,8 @@ private static ResourceScheduler createMockScheduler(Configuration conf) {
 
   private static RMDelegationTokenSecretManager
       createRMDelegationTokenSecretManager(long secretKeyInterval,
-          long tokenMaxLifetime, long tokenRenewInterval) {
+          long tokenMaxLifetime, long tokenRenewInterval,
+          long delegationTokenRemoverScanInterval) {
     ResourceManager rm = mock(ResourceManager.class);
     RMContext rmContext = mock(RMContext.class);
     when(rmContext.getStateStore()).thenReturn(new NullRMStateStore());
@@ -583,7 +587,7 @@ private static ResourceScheduler createMockScheduler(Configuration conf) {
 
     RMDelegationTokenSecretManager rmDtSecretManager =
         new RMDelegationTokenSecretManager(secretKeyInterval, tokenMaxLifetime,
-          tokenRenewInterval, 3600000, rmContext);
+          tokenRenewInterval, delegationTokenRemoverScanInterval, rmContext);
     return rmDtSecretManager;
   }
 }