How to make sure 'this' inside mocha test have access to class properties

问题

const expect = require("chai").expect;

class Test 
{
 constructor(){ this.x= 10;}
 run() {
 describe("test goes here", function() {
  it("sample test", function() {
    expect(this.x).to.be.eq(10);
  });
 });
 }
}

new Test().run();

getting x is undefined.

Issue : this inside describe points to complete different context, how to make x available to this inside mocha test

回答1:

Use arrow functions () => this... or .bind on your functions.

describe("test goes here", () => {
  it("sample test", () => {
    expect(this.x).to.be.eq(10);
  });
 });

来源：https://stackoverflow.com/questions/60212359/how-to-make-sure-this-inside-mocha-test-have-access-to-class-properties