Let's create a separate working directory to learn to write tests. Create a folder called test_js and switch to the test_js directory:
> mkdir test_js
> cd test_js
Let's also create a separate folder for test inside the test_js folder:
> mkdir test
To access mocha, you have to install it globally:
$ npm install mocha -g --save-dev
Let's write a simple test code in mocha. We will write a test for a simple function, which takes two arguments and returns the sum of the arguments.
Let's create a file called add.spec.js inside the test folder and add the following code:
const addUtility = require('./../add.js');
Then, run the following command from the test_js folder:
$ mocha
This test will fail, and we will require a utility called add.js, which does not exist. It displays the following error:
Let's go ahead and write...
