'Calling C{elements} without arguments on a L{domish.Element} returns
all child elements, whatever the qualified name.'

def test_elements(self):

    e = domish.Element((u'testns', u'foo'))
    c1 = e.addElement(u'name')
    c2 = e.addElement((u'testns2', u'baz'))
    c3 = e.addElement(u'quux')
    c4 = e.addElement((u'testns', u'name'))
    elts = list(e.elements())
    self.assertIn(c1, elts)
    self.assertIn(c2, elts)
    self.assertIn(c3, elts)
    self.assertIn(c4, elts)
