This solves the following message when running the tests:
There was 1 PHPUnit test runner deprecation:
1) Your XML configuration validates against a deprecated schema. Migrate your XML configuration using "--migrate-configuration"!
The content is the result of running ./vendor/bin/phpunit --migrate-configuration as suggested by the message. The deprecation message is now resolved.
This solves the following message when running the tests:
The content is the result of running
./vendor/bin/phpunit --migrate-configuration
as suggested by the message. The deprecation message is now resolved.