before and after node test code example

Example 1: mocha js

Mocha is a JavaScript test framework!

var 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);
    });
  });
});

Example 2: mocha js

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Mocha Tests</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="https://unpkg.com/mocha/mocha.css" />
  </head>
  <body>
    <div id="mocha"></div>

    <script src="https://unpkg.com/chai/chai.js"></script>
    <script src="https://unpkg.com/mocha/mocha.js"></script>

    <script class="mocha-init">
      mocha.setup('bdd');
      mocha.checkLeaks();
    </script>
    <script src="test.array.js"></script>
    <script src="test.object.js"></script>
    <script src="test.xhr.js"></script>
    <script class="mocha-exec">
      mocha.run();
    </script>
  </body>
</html>

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