This blog assumes a global install of mocha, although that can also be installed locally. chai is also required as the assertion library - install as a dev dependency.

In anagrams.mocha.js:

const lib = require("./strcmpSolution");
// const mocha = require('mocha');
const chai = require("chai");
const { expect } = chai;
describe("check lowercase of two strings are anagrams", function () {
  it("should handle basic anagram", function () {
    const res = lib.anagram("race car", "racrace");
    expect(res).to.equal(true);
  });

  it("should handle punctuation", function () {
    const res = lib.anagram("race car", "RACE! CAR!");
    expect(res).to.equal(true);
  });

  it("should handle non-anagrams with different lengths", function () {
    const res = lib.anagram("test", "testa");
    expect(res).to.equal(false);
  });

  it("should handle non-anagrams with same length", function () {
    const res = lib.anagram("tests", "testa");
    expect(res).to.equal(false);
  });

  it("should handle anagrams with varying char length", function () {
    const res = lib.anagram("rrracb", "abcrrrr");
    expect(res).to.equal(false);
  });
});
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In index.js.

const anagram = (strA, strB) => cleanStr(strA) === cleanStr(strB);

const cleanStr = (str) =>
  str.replace(/[^\w]/g, "").toLowerCase().split("").sort().join("");

module.exports = {
  anagram,
};
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Change into directory and run mocha anagrams.mocha.js.