cyb70289 commented on code in PR #13250:
URL: https://github.com/apache/arrow/pull/13250#discussion_r883477345


##########
cpp/src/arrow/io/buffered_test.cc:
##########
@@ -297,6 +297,19 @@ TEST_F(TestBufferedOutputStream, Tell) {
   AssertTell(0);
 }
 
+TEST_F(TestBufferedOutputStream, Tell2) {
+  OpenBuffered();
+  AssertTell(0);
+
+  const std::string datastr = GenerateRandomData(10000);

Review Comment:
   A simple test string should be enough. It costs time to generate random data.
   I think we can move this case to existing `Tell` tests, not necessary for 
this new `Tell2` test.



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