Test Fragility #9
Description
Currently, the test suite for the pipeline stages doesn't asynchronously drain the channel outputs of the pipeline. This can lead to the test suite mysteriously hanging after code changes because the number of outputs of a stage has changed. It would be far better to refactor those tests to be asynchronous than it would be to continue relying on the output channels being sufficiently buffered to not hang. Not sure how difficult of a refactor this is, but it doesn't seem terribly hard.