Argthtjtr

Let's say i want to test a function calculateHealth(person) . And let's say the function take a person model argument and return a number from 0% to 100% depending on how healthy the person is. Lets say the person model is costly to create since it has many properties and sub models which also have many properties. I feel like i should mock the person out and substitute it with a simpler version of a person that only behave enough to test my calculateHealth() function. But according to an expert's oppinion (Justin Searls – Please don’t mock me - https://www.youtube.com/watch?v=Af4M8GMoxi4, at 28:14 ) it is a smell if we mock the model value out( for him, it is only ok to mock out dependency but not the model value )

If i have more test like this, it is costly to maintain them if my person model change. What is your opinion?

Since person is complicated to mock, the test for calculateHealth() prove to be difficult. This is a design smell and not the test problem. Instead of passing in a black box person , i should define the interface more clearly, and preferably simple to use and to mock/test.