$ python machine_spec.py
Stub because it isn't used here, and unittest complains if there isn't one. ... ERROR

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ERROR: Stub because it isn't used here, and unittest complains if there isn't one.
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Traceback (most recent call last):
  File "machine_spec.py", line 10, in setUp
    self.machine = Machine()
NameError: global name 'Machine' is not defined

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Ran 1 test in 0.003s

FAILED (errors=1)
$