text: const chai = require("chai");
  const expect = chai.expect;
  const editDistance = require("../src/string/editDistance");
  
  describe("editDistance()", function() {
    "use strict";
  
    it("exists", function() {
      expect(editDistance).to.be.a("function");
    });
  
    it("it should return null", function() {
      const res = editDistance(2434);
      expect(res).to.equal(null);
    });
  
    it("it should return a valid object", function() {
      const res = editDistance("rtg", "abcd");
      expect(res).to.equal(4);
    });
  });
  