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Parts adapted from https://github.com/chrisjbillington/zprocess@89b464c3a2d10cb3282bea625670f807430adf03
Specifically
zprocess.process_tree.OutputInterceptor
Everything works when I run it manually, but the tests don't pass in pytest. Not sure what's going on there, but seems to have something to do with the flushing.
closes #12