Mastering JavaScript Design Patterns - Second Edition

Tips and tricks

I have seen tests where people split up the Arrange-Act-Assert by putting in place comments:

function testMapping(){
  //Arrange
  …
  //Act
  …
  //Assert
  …
}

You're going to wear your fingers to the bone typing those comments for every single test. Instead I just split them up with a blank line. The separation is clear and anybody who knows Arrange-Act-Assert will instantly recognize what it is that you're doing. You'll have seen the example code in this chapter split up in this fashion.

There are countless JavaScript testing libraries available to make your life easier. Choosing one may depend on your preferred style. If you like a gherkin-style syntax then cuumber.js might be for you. Otherwise try mocha, either on its own, or with the ...