test,job: Fix deadlock in TestOneShot_RetryRecoverNoShutdown
#25293
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This test asserts that the function under test is called again if the first call to the callback returned an error. A channel is used to signal to the test function that the callback has started, this signal being the closure of a channel. But channels are only allowed to be closed once, so the code would set the channel to
nil
after closing it and wrap the closing code in a nil-check. This works 99.999% of the time since the consumer of the channel will continue. However, it sometimes happens that the channel is set tonil
before the consumers flow has been started, resulting in a deadlock since reading from a nil channel always blocks. So, to fix it, we now simply look at thei
variable and don't set the channel tonil
anymore.Fixes: #25276