HDFS-10738. Fix TestRefreshUserMappings.testRefreshSuperUserGroupsConfiguration test failure. Contributed by Rakesh R.

(cherry picked from commit 0f701f433dd3be233bf53e856864c82349e8274e)
(cherry picked from commit 7f1879abe642219fce0328a8e96c983601d202b0)

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/security/TestRefreshUserMappings.java

@@ -151,9 +151,13 @@ public class TestRefreshUserMappings {
   @Test
   public void testRefreshSuperUserGroupsConfiguration() throws Exception {
     final String SUPER_USER = "super_user";
-    final String [] GROUP_NAMES1 = new String [] {"gr1" , "gr2"};
-    final String [] GROUP_NAMES2 = new String [] {"gr3" , "gr4"};
-    
+    final List<String> groupNames1 = new ArrayList<>();
+    groupNames1.add("gr1");
+    groupNames1.add("gr2");
+    final List<String> groupNames2 = new ArrayList<>();
+    groupNames2.add("gr3");
+    groupNames2.add("gr4");
+
     //keys in conf
     String userKeyGroups = DefaultImpersonationProvider.getTestProvider().
         getProxySuperuserGroupConfKey(SUPER_USER);
@@ -178,12 +182,12 @@ public class TestRefreshUserMappings {
     
     when(ugi1.getUserName()).thenReturn("userL1");
     when(ugi2.getUserName()).thenReturn("userL2");
-   
+
     // set groups for users
-    when(ugi1.getGroupNames()).thenReturn(GROUP_NAMES1);
-    when(ugi2.getGroupNames()).thenReturn(GROUP_NAMES2);
-   
-    
+    when(ugi1.getGroups()).thenReturn(groupNames1);
+    when(ugi2.getGroups()).thenReturn(groupNames2);
+
+
     // check before
     try {
       ProxyUsers.authorize(ugi1, "127.0.0.1");