'Two L{dns.Record_NULL} instances compare equal if and only if they have
the same payload and ttl.'

def test_null(self):

    self._equalityTest(dns.Record_NULL('foo    bar', 10), dns.Record_NULL('foo    bar', 10), dns.Record_NULL('bar    foo', 10))
    self._equalityTest(dns.Record_NULL('foo    bar', 10), dns.Record_NULL('foo    bar', 10), dns.Record_NULL('foo    bar', 100))
