Hope there are more lessons on API and command...

Btw, for those who getting error below when run the phpunit:

GuzzleHttp\Exception\RequestException: cURL error 60: SSL certificate problem: unable to get local issuer certificate (see https://curl.haxx.se/libcurl/c/libcurl-errors.html )

you may download one of the sample certificate from here https://curl.haxx.se/docs/caextract.html and save it to your <<php path>>\extras\ss\ folder (Windows user);

in php.ini file, uncomment your curl.cainfo and assign the path where you save it. [curl] ; A default value for the CURLOPT_CAINFO option. This is required to be an ; absolute path. curl.cainfo ="<<php path>>\extras\ssl\cacert.pem"

How to TDD Artisan Commands