The Johansen reasonableness test
Johansen v. California State Auto. Assn. Inter-Ins. Bureau (1975) 15 Cal.3d 9 asks whether a prudent insurer, evaluating the claim with an eye toward the insured's interests as well as its own, would have accepted the demand given the facts available at the time. Courts weigh liability evidence, the severity of injuries, whether the demand was clear and time-limited, the adequacy of the insurer's investigation, and its own internal claim valuation.