text: const assert = require('assert');
  const {
    difference,
    union,
    intersection,
  } = require('../../../../lib/util/executors/sets');
  
  describe('executors', () => {
    describe('union', () => {
      it('unifies two sets', () => {
        const result = union(new Set(['cordova']), new Set(['client', 'server']));
        assert.equal(result.size, 3);
        assert.ok(result.has('client'));
        assert.ok(result.has('cordova'));
        assert.ok(result.has('server'));
      });
    });
  
    describe('difference', () => {
      it('returns the difference when b contains nothing from a', () => {
        const result = difference(
          new Set(['cordova']),
          new Set(['client', 'server'])
        );
        assert.equal(result.size, 1);
        assert.ok(result.has('cordova'));
      });
  
      it('returns the difference when b contains one value from a', () => {
        const result = difference(
          new Set(['client', 'cordova']),
          new Set(['client', 'server'])
        );
        assert.equal(result.size, 1);
        assert.ok(result.has('cordova'));
      });
    });
  
    describe('intersection', () => {
      it('returns the intersection', () => {
        const result = intersection(
          new Set(['client', 'cordova']),
          new Set(['client', 'server'])
        );
        assert.equal(result.size, 1);
        assert.ok(result.has('client'));
      });
    });
  });
  