lzhfromustc f2a912a4e6 test: change channel operations to avoid potential goroutine leaks
In these unit tests, goroutines may leak if certain branches are chosen. This commit edits channel operations and buffer sizes, so no matter what branch is chosen, the test will end correctly. This commit doesn't change the semantics of unit tests.
2020-12-09 22:23:21 -05:00
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