Deep expect anonymous function

[EtienneLem]

Is there any way to deeply expect an anonymous function? i.e. Jasmine has jasmine.any(Function)

o = { foo: 'bar', baz: function() {  } }

// Chai (with Mocha)
expect(o).to.deep.equal({
  foo: 'bar',
  baz: Function
})

// Jasmine
expect(o).toEqual({
  foo: 'bar',
  baz: jasmine.any(Function)
})

I know about expect(o).to.have.property('baz').that.is.a('function'), but it can be a little bit more painful to deal with when the object has more keys.

[keithamus]

@EtienneLem thanks for the issue! We discussed matchers a long while ago, over in #97 - but the discussion hasn't moved on much since then. It'd be a big feature to add in Chai, but we could potentially make it very powerful.

Personally I'd like to see some kind of syntax that ties into assertions, like:

// Chai (with Mocha)
expect(o).to.deep.equal({
  foo: 'bar',
  baz: chai.matched.to.be.a('function').and.have.length(2)
});

It would only really be used for deep equals as far as I can see though - so potentially lots of effort for limited scope.

[emmenko]

Any news on this?

[keithamus]

Closing this for a more focussed discussion in #644