Headless browser

headless browser are used for:

• End to End (E2E) Testing (ie integration test)
• test over DOM manipulations

The unit of test is the whole page inside a browser engine. You can emulate and test a complete process that spans across several web pages such as sign up.

The preferred strategy for testing a navigation is to break it down into a series of independent tests where each of which has one “reason” to exist.

Javascript

Javascript unit test will test a function inside a node engine.