savefig kwarg don't use a mutable type as a default argument

jenshnielsen · jenshnielsen · commit 6d585f3d9237 · 2012-10-31T19:30:04.000+01:00
diff --git a/lib/matplotlib/testing/decorators.py b/lib/matplotlib/testing/decorators.py
@@ -167,7 +167,7 @@ def do_test():
 
 def image_comparison(baseline_images=None, extensions=None, tol=1e-3,
                      freetype_version=None, remove_text=False,
-                     savefig_kwarg=dict()):
+                     savefig_kwarg=None):
     """
     call signature::
 
@@ -213,6 +213,10 @@ def image_comparison(baseline_images=None, extensions=None, tol=1e-3,
         # default extensions to test
         extensions = ['png', 'pdf', 'svg']
 
+    if savefig_kwarg is None:
+        #default no kwargs to savefig
+        savefig_kwarg = dict()
+
     def compare_images_decorator(func):
         # We want to run the setup function (the actual test function
         # that generates the figure objects) only once for each type
