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

def test_addRawHeader(self):

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