const expect = require('expect'); const pullBy = require('./pullBy.js'); test('Testing pullBy', () => { //For more information on all the methods supported by tape //Please go to https://github.com/substack/tape expect(typeof pullBy === 'function').toBeTruthy(); var myArray = [{ x: 1 }, { x: 2 }, { x: 3 }, { x: 1 }]; pullBy(myArray, [{ x: 1 }, { x: 3 }], o => o.x); expect(myArray).toEqual([{ x: 2 }]); });