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

def test_frameElementLineNumber(self):

    element = _FrameElement(TagLoader(tags.span(render='lineNumber')), self.frame)
    d = flattenString(None, element)
    d.addCallback(self.assertEqual, (('<span>' + intToBytes((self.base + 1))) + '</span>'))
    return d
