def test_duration_bad_finish(self):
     duration = ostriztools._calculate_duration(1495766591.151192, None)
     assert duration == 0
 def test_duration_bad_start(self):
     duration = ostriztools._calculate_duration(0, 1495768544.573208)
     assert duration == 0
 def test_duration_good(self):
     duration = ostriztools._calculate_duration(1495766591.151192, 1495768544.573208)
     assert duration == 1953.422016