Update development readme

- Instructions on running unit tests
- Listed dependencies

README.md

@@ -6,18 +6,29 @@
 
 There's a Docker configuration to bootstrap a local WordPress installation. To start it:
 
-- From the root directory, run `$ make run`.
+- You'll need both [Docker](https://docs.docker.com/install/) and [yarn](https://yarnpkg.com/) installed on your local machine.
+- From the root directory, run `$ yarn` to install the frontend dependencies.
+- Once that's done, run `$ make run` to build the docker image.
 - Install wordpress with the default values by running `$ make install`.
 - Activate the Disqus plugin using `$ make activate`.
 - Alternatively you can now complete configuration by going to: http://localhost:8888/wp-admin/install.php
 - Otherwise you can continue to: http://localhost:8888/
 
-## Install
+### Unit tests
+
+To run unit tests locally:
+
+- Install [Composer](https://getcomposer.org/), [yarn](https://yarnpkg.com/) and [MySQL](https://dev.mysql.com/doc/refman/5.7/en/installing.html).
+- From the root project directory, run `$ yarn`, `$ composer install` and `$ composer global require "phpunit/phpunit=4.8.*"` (You may change the version to `6.*` if you're running PHP >= 7.0).
+- To create the WordPress test instance, run `$ bash bin/install-wp-tests.sh wordpress_test root '' localhost latest`
+- You should now be able to run `$ make test` to run both the PHPUnit tests and the frontend JavaScript tests.
+
+## Installing to existing WordPress site
 
 To install the plugin on an existing WordPress site, you'll need to build the frontend and create a .zip file:
 
-- From the root directory, run `$ make js`.
-- Compress the entire `disqus` directory into a `.zip` file.
+- Make sure you have [yarn](https://yarnpkg.com/) installed on your local machine.
+- From the root directory, run `$ make dist`.
 - From your WordPress plugin page, select Plugins->Add New->Upload Plugin and choose the `disqus.zip` file you created.
 - Activate the plugin and then install using the instructions in the plugin.