"one of those general precepts of our law of contract is that covenants legally entered into cannot be revoked except by mutual consent of the parties thereto (article 1134 C.nap) and another that the failure by one party to a contract to perform his part of the agreement gives a right to the other to ask for his annulment (article 1184 C.nap)". Vacoas Transport v. Pointu (1970) MR 35.

What would be the effect of the above provisions with regard to a contract of employment of indeterminate duration? Explain your answer with reference to case law.