Because you don’t know what you’ll need that wrapper beforehand, that’s my entire point.
Unless you’re only doing trivial changes, the chances are very high that you won’t be able to design the class structure. Or, you end up essentially writing the code to be able to write the tests, which kind of defeats the purpose.
Can’t you just add the wrapper to the test as well, if it’s easy to do in the actual code?
If you have to ask “can’t you just” the answer is almost always no.
Well, yeah, but I was kind of hoping you’d explain why.
Because you don’t know what you’ll need that wrapper beforehand, that’s my entire point.
Unless you’re only doing trivial changes, the chances are very high that you won’t be able to design the class structure. Or, you end up essentially writing the code to be able to write the tests, which kind of defeats the purpose.