all: fix goroutine leaks in unit tests by adding 1-elem channel buffer #20666
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ethereum#20666) This fixes a bunch of cases where a timeout in the test would leak a goroutine.
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In server_test.go,
Goroutine may leak because sending to
acceptis blocked on L141 whenselecton L156 selects timeout on L204. Althought.Error()is called in this case, it won't stop the leaking, because "Calling FailNow does not stop those other goroutines.". The fix is to replace the unbuffered channel with a buffered channel (buffer size 1), and the semantic is not changed.There are 5 bugs following the same pattern and fix in #20663.