Parties to an employment agreement can not avoid the duty to perform the contract honestly by including language in the agreement that says the duty of honest contractual performance simply does not apply. (torkinmanes.com)
This is a general doctrine of contract law that imposes as a contractual minimum a standard of honest contractual performance. (thelitigator.ca)
The Duty of Honest Contractual Performance with Marco P. Falco - Torkin Manes LegalPoint Video February 2015 (torkinmanes.com)