Testing a easy method with Mocha and Javascript

#javascript #testing #webdev #tutorial

🔌 Installation

First init the repo and install mocha:

Now let's try if mocha works, creating a folder called test in the root of the project and inside this folder creating a file:

That file will contains an easy assert that checks if a variable contains the string that we expect:

Voilà, it works like a charm:

If we try to put a test that is wrong:

The test will fail:

We will create a file called strings.js that will contains only one function called stringMerge, super easy:

Special mention to Mintlify extension that writes all JSDocs for me 😃

and finally the test:

Some considerations here:

In the line 2 we're loading the file that contains our famous method.
We're implementing the triple A pattern (Arrange, Act, Assert) you can find more info searching on Google.
The magic happens in line 17 when we're checking the result of our method.

And the result:

That's it for today! I will try to create another easy post before Sunday with Jest.