Merge pull request #2567 from megies/compare_image_exceptions

more informative exceptions for empty/not-existing images in compare_images()
matplotlib · Nov 23, 2013 · 5b082a5 · 5b082a5
2 parents f8687b0 + f3fa220
commit 5b082a5
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/lib/matplotlib/testing/compare.py b/lib/matplotlib/testing/compare.py
@@ -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)