Learning Node.js Development

Test spies

In this section, which is the final section for the testing chapter, we'll learn some pretty advanced testing techniques. We'll be using these techniques as we build real-world apps, but for now let's start off with an example. We'll worry about the vocabulary for what we're about to do in just a second.

For the moment, we'll close all our current files and create a new directory in the root of the project. We'll make a new folder called spies. We'll talk about what exactly spies are and how they relate to testing in just a moment. Inside spies, we'll make two files: app.js (this is the file that we'll be testing) and a second one, called db.js. In our example, we can just assume that db.js is a file that has all sorts of methods ...