fix test

Author: jasongrout

ipywidgets/widgets/tests/test_widget.py

@@ -21,7 +21,7 @@ def test_no_widget_view():
         display(w)
 
     if version_info >= (6, 1):
-        assert len(cap.outputs) == 1 and cap.outputs[0].data == msg, repr(cap.outputs)
+        assert len(cap.outputs) == 1 and cap.outputs[0].data == msg, (len(cap.outputs), repr(cap.outputs[0].data), msg)
     else:
         assert cap.outputs == [], repr(cap.outputs)