v4 Unit Tests

Perserving Mocha Scope

Tests are written in Mocha, while the tests support ES6 features, it's important to retain the Mocha scope when writing tests. Avoid the use of fat-arrows. For instance:

describe('ClassName', function() {
  it('methodName1', () => { // incorrect
    // cannot use "this" for Mocha API
  });

  it('methodName', function() { // correct
     this.timeout(4000); // preserve Mocha scope
  });
});