pan3793 commented on code in PR #53192:
URL: https://github.com/apache/spark/pull/53192#discussion_r2558689617


##########
core/src/test/scala/org/apache/spark/util/UtilsSuite.scala:
##########
@@ -1132,37 +1131,35 @@ class UtilsSuite extends SparkFunSuite with 
ResetSystemProperties with PrivateMe
 
   test("ThreadInfoOrdering") {
     val task1T = mock[ThreadInfo]
-    doReturn(11L).when(task1T).getThreadId
-    doReturn("Executor task launch worker for task 1.0 in stage 1.0 (TID 11)")
-      .when(task1T).getThreadName
-    doReturn("Executor task launch worker for task 1.0 in stage 1.0 (TID 11)")
-      .when(task1T).toString
+    when(task1T.getThreadId).thenReturn(11L)
+    when(task1T.getThreadName)
+      .thenReturn("Executor task launch worker for task 1.0 in stage 1.0 (TID 
11)")
+    when(task1T.toString)
+      .thenReturn("Executor task launch worker for task 1.0 in stage 1.0 (TID 
11)")
 
     val task2T = mock[ThreadInfo]
-    doReturn(12L).when(task2T).getThreadId
-    doReturn("Executor task launch worker for task 2.0 in stage 1.0 (TID 22)")
-      .when(task2T).getThreadName
-    doReturn("Executor task launch worker for task 2.0 in stage 1.0 (TID 22)")
-      .when(task2T).toString
+    when(task2T.getThreadId).thenReturn(12L)
+    when(task2T.getThreadName)
+      .thenReturn("Executor task launch worker for task 2.0 in stage 1.0 (TID 
22)")
+    when(task2T.toString)
+      .thenReturn("Executor task launch worker for task 2.0 in stage 1.0 (TID 
22)")
 
     val connectExecuteOp1T = mock[ThreadInfo]
-    doReturn(21L).when(connectExecuteOp1T).getThreadId
-    
doReturn("SparkConnectExecuteThread_opId=16148fb4-4189-43c3-b8d4-8b3b6ddd41c7")
-      .when(connectExecuteOp1T).getThreadName
-    
doReturn("SparkConnectExecuteThread_opId=16148fb4-4189-43c3-b8d4-8b3b6ddd41c7")
-      .when(connectExecuteOp1T).toString
+    when(connectExecuteOp1T.getThreadId).thenReturn(21L)
+    when(connectExecuteOp1T.getThreadName)
+      
.thenReturn("SparkConnectExecuteThread_opId=16148fb4-4189-43c3-b8d4-8b3b6ddd41c7")
+    when(connectExecuteOp1T.toString)
+      
.thenReturn("SparkConnectExecuteThread_opId=16148fb4-4189-43c3-b8d4-8b3b6ddd41c7")
 
     val connectExecuteOp2T = mock[ThreadInfo]
-    doReturn(22L).when(connectExecuteOp2T).getThreadId
-    
doReturn("SparkConnectExecuteThread_opId=4e4d1cac-ffde-46c1-b7c2-808b726cb47e")
-      .when(connectExecuteOp2T).getThreadName
-    
doReturn("SparkConnectExecuteThread_opId=4e4d1cac-ffde-46c1-b7c2-808b726cb47e")
-      .when(connectExecuteOp2T).toString
-
-    val threadInfoOrderingMethod =
-      PrivateMethod[Ordering[ThreadInfo]](Symbol("threadInfoOrdering"))
+    when(connectExecuteOp2T.getThreadId).thenReturn(22L)
+    when(connectExecuteOp2T.getThreadName)
+      
.thenReturn("SparkConnectExecuteThread_opId=4e4d1cac-ffde-46c1-b7c2-808b726cb47e")
+    when(connectExecuteOp2T.toString)
+      
.thenReturn("SparkConnectExecuteThread_opId=4e4d1cac-ffde-46c1-b7c2-808b726cb47e")
+
     val sorted = Seq(connectExecuteOp1T, connectExecuteOp2T, task1T, task2T)
-      .sorted(Utils.invokePrivate(threadInfoOrderingMethod()))
+      .sorted(Utils.threadInfoOrdering)

Review Comment:
   Hmm... this looks simple, but I was told to prefer using `invokePrivate` to 
avoid exposing private methods/fields, not sure which is the best practice for 
this case.
   
   cc @LuciferYang for more inputs



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