CODEWITHSUNDEEP
node.jssetshould.js
Lea Hayes
Lea Hayes

Reputation: 64226

How to assert that Set contains the required values with should.js?

I am using the should.js library for assertions in my unit tests and was wondering how I would go about asserting that the contents of a Set matches the expectation.

let actualValues = new Set();
actualValues.add(2);
actualValues.add(4);
actualValues.add(6);

actualValues.should.be....... ?

My first instinct was to use Array.from(actualValues) and then compare that with the expected values; but naturally the ordering of actualValues is undefined since it's a Set.

The following works; but it seems quite verbose:

actualValues.size.should.be.eql(3);
actualValues.has(2).should.be.true();
actualValues.has(4).should.be.true();
actualValues.has(6).should.be.true();

Upvotes: 0

Views: 1475

Answers (1)

Peter Lyons
Peter Lyons

Reputation: 146104

You could iterate over one set and assert each item is also in the second set, then assert their sizes are equal.

const should = require('should')

const set1 = new Set(['red', 'green', 'blue']);
const set2 = new Set(['blue', 'red', 'green']);
for (let x of set1) {
  set2.has(x).should.be.true()
}
set2.size.should.equal(set1.size)

This might be a good candidate for at least a helper function like haveSameContent(set1, set2) which you may also be able to code into a should.js extension if you want to be able to do something like set1.should.have.same.items.as(set2).

Upvotes: 1

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