$ python -mdoctest vtodo/listing/filler.py 
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File "vtodo/listing/filler.py", line 77, in filler.get_css_class_dict
Failed example:
    d['b']  # doctest: +ELLIPSIS
Expected:
    [<DOM Element: span at ...>]
Got:
    [<DOM Element: div at 0x7f3e972e3508>]
**********************************************************************
1 items had failures:
   1 of   4 in filler.get_css_class_dict
***Test Failed*** 1 failures.