What constitutes constructive dismissal in common law Canadian common law?

35. What constitutes constructive dismissal has been the subject matter of many court and tribunal decisions. In Farber v. Royal Trust Co., 1997 CanLII 387 (SCC), [1997] 1 S.C.R. 846, at paragraph 33, Gonthier, J. wrote: Thus, it has been established in a number of Canadian common law decisions that where an employer unilaterally makes a fundamental or substantial change to an employee’s contract of employment - a change that violates the contract’s terms - the employer is committing a fundamental breach of the contract that results in its termination and entitles the employee to consider himself or herself constructively dismissed.