Running SilverStripe 3.7 on PHP 7.4
SilverStripe's standard test tools require
phpunit/phpunit-mock-objects to run. This package has been deprecated and
doesn't support PHP 7.4.
SilverStripe is using a fork for its own PHP 7.3 unit tests:
You can use this fork for your own project by running this command:
composer require --dev sminnee/phpunit-mock-objects:^3.4.7
This fork is not a supported module and SilverStripe does not commit to maintaining it.