The simplest way to get started if you are using PHP 5.4 or above is to start the internal PHP cli-server in the root directory:
php -S 0.0.0.0:8080 -t public/ public/index.php
php composer.phar install
From the project root run the following command in terminal
php public/index.php scrape bbc-top-shared
From the project root run phpunit -c ./tests/phpunit
Experimental to see how Behat runs, I haven't wrote BDD tests prior to this.
From the project root run vendor/bin/behat --config tests/behat/behat.yml