'A L{Headers} instance compares equal to itself and to another
L{Headers} instance with the same values.'

def test_headersComparison(self):

    first = Headers()
    first.setRawHeaders('foo', ['panda'])
    second = Headers()
    second.setRawHeaders('foo', ['panda'])
    third = Headers()
    third.setRawHeaders('foo', ['lemur', 'panda'])
    self.assertEqual(first, first)
    self.assertEqual(first, second)
    self.assertNotEqual(first, third)
