👍 we should use our Http::sendRequest method instead (which uses the configured proxy). @tassoman a pull request would be very welcome!

I'll do my best! Looks like I can do it 🏄

Well, looking deeper looks like file_get_contents in tests is correctly used for fetching inside local file system. So doing a Http::sendHttpRequest($thing, $timeout) here is wrong.
This issue looks like a nevermind thing.

But my doubt still here, the question is: why while I'm running my plugin's Unit Tests, Piwik's console Runs also Referers Plugin's unit tests looking for missing file /home/systemuser/path/to/piwik/vendor/piwik/searchengine-and-social-list/SearchEngines.yml ?

@tassoman you need to run composer install to remove this error

Crazy! I forgot running composer update, do you think would be useful adding a check in the console command while it's in developer mode?

That check could manage local composer's update timestamp displaying a CLI warning message if it feels composer not enough updated ...

Or it's simply the best practice 📗 starting each day with:

$ composer selfupdate
$ composer global update
$ composer update

😄