func checkAlwaysInvalid(c *gc.C, config discoverspaces.Config, message string) {
check := func(err error) {
c.Check(err.Error(), gc.Equals, message)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
err := config.Validate()
check(err)
worker, err := discoverspaces.NewWorker(config)
c.Check(worker, gc.IsNil)
check(err)
}
func checkConfigValid(c *gc.C, config discoverspaces.Config) {
c.Check(config.Validate(), jc.ErrorIsNil)
}