logos-messaging-js/src/lib/discovery/index.spec.ts

import { expect } from 'chai';

import { getPseudoRandomSubset } from './index';

describe('Discovery', () => {
  it('returns all values when wanted number matches available values', function () {
    const values = ['a', 'b', 'c'];

    const res = getPseudoRandomSubset(values, 3);

    expect(res.length).to.eq(3);
    expect(res.includes('a')).to.be.true;
    expect(res.includes('b')).to.be.true;
    expect(res.includes('c')).to.be.true;
  });

  it('returns all values when wanted number is greater than available values', function () {
    const values = ['a', 'b', 'c'];

    const res = getPseudoRandomSubset(values, 5);

    expect(res.length).to.eq(3);
    expect(res.includes('a')).to.be.true;
    expect(res.includes('b')).to.be.true;
    expect(res.includes('c')).to.be.true;
  });

  it('returns a subset of values when wanted number is lesser than available values', function () {
    const values = ['a', 'b', 'c'];

    const res = getPseudoRandomSubset(values, 2);

    expect(res.length).to.eq(2);
  });
});