Chai expect: an array to contain an object with at least these properties and values

Most elegant solution I could come up with (with the help of lodash):

expect(_.some(array, { 'a': 1, 'c': 3 })).to.be.true;

The desired solution seems to be something like:

expect(array).to.include.something.that.includes({a: 1, c: 3});

I.e. array contains an item which includes those properties. Unfortunately, it appears to not be supported by chai-things at the moment. For the foreseeable future.

After a number of different attempts, I've found that converting the original array makes the task easier. This should work without additional libraries:

// Get items that interest us/remove items that don't.
const simplifiedArray = array.map(x => ({a: x.a, c: x.c}));
// Now we can do a simple comparison.
expect(simplifiedArray).to.deep.include({a: 1, c: 3});

This also allows you to check for several objects at the same time (my use case).

expect(simplifiedArray).to.include.deep.members([{
  a: 1,
  c: 3
}, {
  a: 3,
  c: 5
}]);

Seems like the chai-subset plugin from chai seems to have done the trick. Here is something I have working:

const chai = require('chai');
const chaiSubset = require('chai-subset');
chai.use(chaiSubset);
const expect = chai.expect;

 expect([ { type: 'text',
    id: 'name',
    name: 'name',
    placeholder: 'John Smith',
    required: 'required' },
  { type: 'email',
    id: 'email',
    name: 'email',
    placeholder: '[email protected]',
    required: 'required' },
  { type: 'submit' } ]).containSubset([{ type: 'text', type: 'email', type: 'submit' }]);