ds-algo-study/DS-n-Algos/ALGO/callbacks-solution/test/10-my-every-test.js

Just experimenting with publishing a package

const chai = require("chai");
const spies = require("chai-spies");
const expect = chai.expect;
chai.use(spies);

const myEvery = require("../problems/10-my-every.js");

describe("myEvery", function() {
  it("should mimic the built-in Array#myEvery", function() {
    let isEven = function(num) {
      return num % 2 === 0;
    };

    let hasO = function(string) {
      return string.includes("o");
    };

    expect(myEvery([4, 8, 6, 10], isEven)).to.be.true;
    expect(myEvery([4, 7, 6, 10], isEven)).to.be.false;
    expect(myEvery(["book", "door"], hasO)).to.be.true;
    expect(myEvery(["book", "door", "pen"], hasO)).to.be.false;
  });

  it("should not call the built-in Array#every", function() {
    const everySpy = chai.spy.on(Array.prototype, "every");
    myEvery([4, 8, 6, 10], function(num) {
      return num % 2 === 0;
    });
    expect(everySpy).to.have.not.been.called();
  });
});