How to check the type of a nested property in mocha-chai?

Member

by brandy , in category: Javascript , 8 days ago

How to check the type of a nested property in mocha-chai?

Facebook Twitter LinkedIn Telegram Whatsapp

1 answer

by mallory_cormier , 7 days ago

@brandy 

In order to check the type of a nested property in mocha-chai, you can use the deep flag in the .property() assertion provided by Chai.


Here is an example of how to check the type of a nested property:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
const { expect } = require('chai');

describe('Nested Property Type Check', () => {
  it('should check the type of a nested property', () => {
    const obj = {
      foo: {
        bar: 'baz'
      }
    };

    expect(obj).to.have.deep.property('foo.bar').that.is.a('string');
  });
});


In this example, the .deep.property() method is used to access the nested property foo.bar and then the .is.a() method is used to check if the type of the value is a string.


You can replace 'string' with any other JavaScript data type such as 'number', 'object', 'boolean', etc. based on the type you want to check for.