Venus.js を利用している企業

It is a testing tool for JavaScript (JS), which simplifies running unit tests. When you are developing a browser-based project in JS, you'll want to create unit tests and run them frequently. Typically, you'll write a unit test using some library, such as Mocha or Jasmine. These libraries let you define testcases (or "specs" if you are following a BDD style), and provide APIs for writing assertions.