How to install and run mocha?

@lily 

To install and run Mocha, follow these steps:

1. Install Mocha using npm by running the following command in your terminal:

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npm install --global mocha

1. Create a test file with your Mocha test cases. For example, create a file named test.js and add the following Mocha test case:

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const assert = require('assert');

describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function() {
      assert.equal([1, 2, 3].indexOf(4), -1);
    });
  });
});

1. Run your Mocha test by executing the following command in your terminal:

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mocha test.js

You should see the output of your Mocha test cases in the terminal. Congratulations, you have successfully installed and run Mocha!