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TST : add time out to ani.save #2776

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TST : add time out to ani.save #2776

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20 changes: 18 additions & 2 deletions lib/matplotlib/tests/test_animation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,9 @@
unicode_literals)

import six

import sys
import tempfile

import signal
import numpy as np
from nose import with_setup
from matplotlib import pyplot as plt
Expand All @@ -20,6 +20,14 @@
imagemagick='gif', imagemagick_file='gif')


class TimeoutException(Exception):
pass


def _timeout_handler(signum, frame):
raise TimeoutException()


# Smoke test for saving animations. In the future, we should probably
# design more sophisticated tests which compare resulting frames a-la
# matplotlib.testing.image_comparison
Expand Down Expand Up @@ -51,12 +59,20 @@ def animate(i):
# Use NamedTemporaryFile: will be automatically deleted
F = tempfile.NamedTemporaryFile(suffix='.' + extension)
anim = animation.FuncAnimation(fig, animate, init_func=init, frames=5)

old_handler = signal.signal(signal.SIGALRM, _timeout_handler)

try:
signal.alarm(100)
anim.save(F.name, fps=30, writer=writer)
except UnicodeDecodeError:
raise KnownFailureTest("There can be errors in the numpy " +
"import stack, " +
"see issues #1891 and #2679")
except TimeoutException:
raise KnownFailureTest("pipe timed out, known issue")
finally:
signal.signal(signal.SIGALRM, old_handler)


@cleanup
Expand Down