func (s *suite) breakMethods(c *gc.C, e environs.NetworkingEnviron, names ...string) { cfg := e.Config() brokenCfg, err := cfg.Apply(map[string]interface{}{ "broken": strings.Join(names, " "), }) c.Assert(err, jc.ErrorIsNil) err = e.SetConfig(brokenCfg) c.Assert(err, jc.ErrorIsNil) }