PHPUnit shows Warning message "The configuration file did not pass validation!"

[mukeshpanchal27]

I observed some warning messages related to unit tests. Starting from PHP 7.1, we've been encountering these messages. You can find the details here: https://github.com/WordPress/plugin-check/actions/runs/7281778666.

Warning - The configuration file did not pass validation!
The following problems have been detected:

Line 9:
- Element 'coverage': This element is not expected.

Test results may not be as expected.

And another is:

Warning - The configuration file did not pass validation!
The following problems have been detected:

Line 25:
- Element 'filter': This element is not expected.

Test results may not be as expected.

[mukeshpanchal27]

The phpunit.xml.dist and tests/phpunit/multisite.xml were updated in #321 and added coverage and filter tags.

cc. @eclarke1 @felixarntz @swissspidy @joemcgill

[swissspidy]

Since we have to run tests with multiple PHPUnit versions I don't think it's possible to have a single config file format that works for all versions without warnings. So this is expected IMHO and not a big deal. Just warnings.

[felixarntz]

+1 to @swissspidy's feedback, I don't think this is crucial enough to go through the hassle of multiple config files. I would suggest we close this as not planned.