testdoc.ts

import { expect } from "chai";
import "mocha";
import {push} from './index';

describe("Push", () => {
    it("should have four elements post push", () => {
        const original = ['a', 'b'];
        const result = ['a', 'b', 'c', 'd'];          
      expect(push(original, 'c', 'd')).to.eql(result);;
    });
  });