Add missing class attribute to NullMovieWriter in test_animation.py

efiring · efiring · commit 6a9e968cf484 · 2016-05-15T17:57:03.000-10:00
diff --git a/lib/matplotlib/tests/test_animation.py b/lib/matplotlib/tests/test_animation.py
@@ -30,6 +30,8 @@ class NullMovieWriter(animation.AbstractMovieWriter):
     it cannot be added to the 'writers' registry.
     """
 
+    frame_size_can_vary = True
+
     def setup(self, fig, outfile, dpi, *args):
         self.fig = fig
         self.outfile = outfile
