def test_defaultResolvConf(self):
        """
        L{client.createResolver} returns a L{resolve.ResolverChain} including a
        L{client.Resolver} using I{/etc/resolv.conf} if no alternate resolver
        configuration file is specified.
        """
        with AlternateReactor(Clock()):
            resolver = client.createResolver()
        self._resolvConfTest(resolver, b"/etc/resolv.conf")

        L{client.createResolver} returns a L{resolve.ResolverChain} including a
        L{client.Resolver} using I{/etc/resolv.conf} if no alternate resolver
        configuration file is specified.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_client.py