What is the purpose of .end(fn)?

[JohnieLee]

I assumed that you can do additional validation in .end(fn) with fn being the validation methods. But it seems like errors thrown from there are just swallowed.

[crummy]

One thing I use it for is sanity checking when writing the tests - end((err, res, body) => console.log(body))

I think validation should happen in expect() methods.