What is the test for sentencing a single offender to two consecutive sentences?

In R v. Geldart, 2016 ABCA 267, at paragraph 2, it was held that whether “sentences should be consecutive is generally related to the ‘totality’ principle. The sentencing judge is to consider whether an accumulation of sentences is unduly long or harsh, but the fundamental principle is to achieve a result that is proportionate to the gravity of the offences committed and the degree of responsibility of the offender: s 718.1 of the Criminal Code...”