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more informative exceptions for empty/not-existing images in compare_images() #2567

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merged 1 commit into from Nov 23, 2013
Merged

more informative exceptions for empty/not-existing images in compare_images() #2567

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7 changes: 7 additions & 0 deletions lib/matplotlib/testing/compare.py
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Expand Up @@ -280,6 +280,13 @@ def compare_images( expected, actual, tol, in_decorator=False ):
- in_decorator If called from image_comparison decorator, this should be
True. (default=False)
'''
if not os.path.exists(actual):
msg = "Output image %s does not exist." % actual
raise Exception(msg)

if os.stat(actual).st_size == 0:
msg = "Output image file %s is empty." % actual
raise Exception(msg)

verify(actual)

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