'The I{function} renderer of L{_FrameElement} renders the line number
associated with the frame object used to initialize the
L{_FrameElement}.'

def test_frameElementFunction(self):

    element = _FrameElement(TagLoader(tags.span(render='function')), self.frame)
    d = flattenString(None, element)
    d.addCallback(self.assertEqual, '<span>lineNumberProbeAlsoBroken</span>')
    return d
