Match partial objects in Chai assertions?

Question

I am looking for the best way to match the following:

expect([
    {
        C1: \'xxx\',
        C0: \'this causes it not to match.\'
    }
]).to.deep.incl         


        

Answer 1

chai-subset or chai-fuzzy might also perform what you're looking for.

Chai-subset should work like this:

expect([
  {
    C1: 'xxx',
    C0: 'this causes it not to match.'
  }
]).to.containSubset([{C1: 'xxx'}]);

Personally if I don't want to include another plugin I will use the property or keys matchers that chai includes:

([
  {
    C1: 'xxx',
    C0: 'this causes it not to match.'
  }
]).forEach(obj => {
  expect(obj).to.have.key('C1'); // or...
  expect(obj).to.have.property('C1', 'xxx');
});

Answer 2

Clean, functional and without dependencies

simply use a map to filter the key you want to check

something like:

const array = [
    {
        C1: 'xxx',
        C0: 'this causes it not to match.'
    }
];

expect(array.map(e=>e.C1)).to.include("xxx");

https://www.chaijs.com/api/bdd/