westonpace commented on a change in pull request #10258:
URL: https://github.com/apache/arrow/pull/10258#discussion_r643636029



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File path: cpp/src/arrow/util/test_common.h
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@@ -85,4 +88,18 @@ inline void AssertIteratorExhausted(Iterator<T>& it) {
 
 Transformer<TestInt, TestStr> MakeFilter(std::function<bool(TestInt&)> filter);
 
+class MockExecutor : public internal::Executor {

Review comment:
       There is a bit of categorization based on folder (e.g. 
`util/test_common.h` vs `io/test_common.h`).  This file isn't really all that 
large.  However, it could probably be split into `test_iterator_common.h` and 
`test_thread_pool_common.h`.  Or am I missing the point?




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