def test_ok_remote_masters(mock_get_by_hostname):
mock_get_by_hostname.return_value = ('myhost', [], ['1.2.3.4', '1.2.3.5'])
ips, output = utils.calculate_remote_masters('myhost')
assert output is None
assert ips == ['1.2.3.4', '1.2.3.5']
def test_bad_calculate_remote_master(mock_get_by_hostname):
mock_get_by_hostname.side_effect = gaierror('foo', 'bar')
ips, output = utils.calculate_remote_masters('myhost')
assert ips == []
assert 'ERROR while doing DNS lookup of paasta-myhost.yelp:\nbar\n' in output
