test for bug: TeeStream cannot handle high output (ie cat thousand_lines) #20
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First attempt at e2e testing of the TeeStream class.
Currently not passing when using cat with more than 10^3 lines
Theres a couple problems. [minor] First, it isn't deterministic on how much is written at a time, ie 250 lines one call, 300 the next, so asserting has_calls isn't working.
Bigger problem: somewhere between cat 100lines and cat 1000lines, TeeStream fails to print the whole thing before closing.