def test_hinfo(self):
        """
        Two L{dns.Record_HINFO} instances compare equal if and only if they
        have the same cpu, os, and ttl.
        """
        # Vary the cpu
        self._equalityTest(
            dns.Record_HINFO('x86-64', 'plan9', 10),
            dns.Record_HINFO('x86-64', 'plan9', 10),
            dns.Record_HINFO('i386', 'plan9', 10))
        # Vary the os
        self._equalityTest(
            dns.Record_HINFO('x86-64', 'plan9', 10),
            dns.Record_HINFO('x86-64', 'plan9', 10),
            dns.Record_HINFO('x86-64', 'plan11', 10))
        # Vary the ttl
        self._equalityTest(
            dns.Record_HINFO('x86-64', 'plan9', 10),
            dns.Record_HINFO('x86-64', 'plan9', 10),
            dns.Record_HINFO('x86-64', 'plan9', 100))

        Two L{dns.Record_HINFO} instances compare equal if and only if they
        have the same cpu, os, and ttl.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_dns.py