Assert that a collection contains a value satisfying a condition

[radekn]

I stumbled once into a use case that seems not to be covered by must - to assert that a collection (object or array) contains a value satifsying a specific condition.

There is includes matcher, but it only checks for strict equality, so I couldn't use it. I think I ended up using Lodash to find the element, and then used exist matcher on the result. It worked well, but left me with the feeling that it would be much nicer (more concise and idiomatic) if I could do it directly with the assertion library.

Any thoughts?

[moll]

Hey!

You mean something like Array.prototype.some? I've thought of something like it, akin to the "middleware" thing that Must.prototype.then is — allow you to call foo.must.have.some.eql({name: "John"}) or equivalent.

[radekn]

Yes, having something like this would be awesome :)