1 files changed, 12 insertions, 1 deletions
diff --git a/libdimension-python/tests/demo.py b/libdimension-python/tests/demo.py
index e9cdc7b..187f4ef 100755
--- a/libdimension-python/tests/demo.py
+++ b/libdimension-python/tests/demo.py
@@ -24,4 +24,15 @@ from dimension import *
 # Treat warnings as errors for tests
 dieOnWarnings(True)
 
-scene = Scene()
+canvas = Canvas(width = 768, height = 480)
+
+havePNG = True
+try:
+    canvas.optimizePNG()
+except OSError as e:
+    if e.errno == errno.ENOSYS:
+        havePNG = False
+    else:
+        raise
+
+scene = Scene(canvas = canvas)