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

Question

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

score 0 · Accepted Answer · answered Feb 13 '20 at 16:22

0

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

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

answered Feb 13 '20 at 16:22

Daniel A. White

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thanks for update, just curious how arrow function is different from regular function ? – user522170 Feb 13 '20 at 16:32
@user522170 https://stackoverflow.com/questions/24900875/whats-the-meaning-of-an-arrow-formed-from-equals-greater-than-in-javas – Daniel A. White Feb 13 '20 at 16:33

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

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