Update commands documentation

docs/general/commands.md

@@ -26,28 +26,70 @@ $ npm run build
 
 Gets your application ready for deployment. Optimizes and minifies all files, and generates a folder called `build`. `build` includes all files you need for your application. Upload the contents of `build` to your web server to see it live!
 
-## Performance testing
+## Testing
+
+## Unit testing
+
+```Shell
+$ npm run test
+```
+
+Tests your application with the unit tests specified in the `*test.js` files throughout the application. This'll run the tests in Chrome, but you can choose different browsers.
+
+### Browsers
+
+To choose the browser to run your unit tests in (Chrome is run by default), run one of the following commands:
+
+#### Firefox
+
+```Shell
+$ npm run test:firefox
+```
+
+#### Safari
+
+```Shell
+$ npm run test:safari
+```
+
+#### Internet Explorer
+
+*Windows only!*
+
+```Shell
+$ npm run test:ie
+```
+
+### Watching
+
+To watch changes to your application and rerun tests whenever a file changes run
+
+```Shell
+$ npm run test:watch
+```
+
+### Performance testing
 
 ```Shell
 $ npm run pagespeed
 ```
 
 With the development server running (i.e. while `$ npm start` is running in another tab), enter this command to run Google PageSpeed Insights and get a performance check right in your terminal!
 
-## Browser testing
+### Test around the world
 
 ```Shell
 $ npm run serve
 ```
 
-This will run a server that's accessible in the entire local network and shows the version of the app that's in the `build` folder. Useful for testing on different devices!
+This will run a server that's accessible on the entire world and shows the version of the app that's in the `build` folder. Useful for testing on different devices in different locations!
 
 > Note: This assumes you have done a build with `npm run build` before. The changes you make in your application won't be reflected in the application unless you run `npm run build` again.
 
-## Unit testing
+## Linting
+
+Lint your JavaScript with this command.
 
 ```Shell
-$ npm run test
+$ npm run lint
 ```
-
-Tests your application with the unit tests specified in the `test` folder.