How to test nested object with chai and mocha?

@aubrey 

To test nested objects with Chai and Mocha, you can use the expect assertion style provided by Chai to make assertions on the properties and values of the nested object. Here's an example of how to test a nested object using Chai and Mocha:

1. Install Chai and Mocha in your project by running the following command in your terminal:

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npm install chai mocha --save-dev

1. Create a test file (e.g., test.js) and require Chai and Mocha at the top of the file:

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const expect = require('chai').expect;
const { describe, it } = require('mocha');

1. Write a test case using the expect function to make assertions on the nested object:

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describe('nested object test', () => {
  it('should test if nested object is equal to expected value', () => {
    const obj = {
      a: 1,
      b: {
        c: 2,
        d: {
          e: 3
        }
      }
    };

    expect(obj).to.deep.equal({
      a: 1,
      b: {
        c: 2,
        d: {
          e: 3
        }
      }
    });
  });
});

1. Run the Mocha test runner in your terminal to execute the test:

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npx mocha test.js

You should see the test output indicating whether the nested object test passed or failed based on the assertions made with Chai's expect function.