'L{Headers.addRawHeader} adds a new value for a given header.'

def test_addRawHeader(self):

    h = Headers()
    h.addRawHeader(u'test', u'lemur')
    self.assertEqual(h.getRawHeaders(u'test'), [u'lemur'])
    h.addRawHeader(u'test', u'panda')
    self.assertEqual(h.getRawHeaders(u'test'), [u'lemur', u'panda'])
    self.assertEqual(h.getRawHeaders('test'), ['lemur', 'panda'])
