Fixed job.IsValid and added tests (#21501)

model/job.go

@@ -99,12 +99,13 @@ func (j *Job) IsValid() *AppError {
 	}
 
 	switch j.Status {
-	case JobStatusPending:
-	case JobStatusInProgress:
-	case JobStatusSuccess:
-	case JobStatusError:
-	case JobStatusCancelRequested:
-	case JobStatusCanceled:
+	case JobStatusPending,
+		JobStatusInProgress,
+		JobStatusSuccess,
+		JobStatusError,
+		JobStatusWarning,
+		JobStatusCancelRequested,
+		JobStatusCanceled:
 	default:
 		return NewAppError("Job.IsValid", "model.job.is_valid.status.app_error", nil, "id="+j.Id, http.StatusBadRequest)
 	}