How to test d3.js with mocha?

@darrion.kuhn 

To test d3.js with Mocha, you can follow these steps:

1. Install Mocha and Chai (a testing library) using npm:

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npm install mocha chai --save-dev

1. Create a test file for your d3.js code. For example, you can create a test.js file with the following content:

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const assert = require('chai').assert;
const d3 = require('d3');

describe('d3.js functionality', function () {
  it('should exist', function () {
    assert.isDefined(d3, 'd3 should be defined');
  });

  // Add more test cases here
});

1. Write test cases for your d3.js code within the describe block. You can use Chai's assertion methods to write test cases for different functionalities of d3.js.
2. Run your tests using Mocha:

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npx mocha test.js

This will run the tests in your test.js file and output the results in the console.

You can also use other testing libraries or frameworks like Karma or Jest to test d3.js code. Just make sure to set up the testing environment correctly and write relevant test cases for your code.