Update PHPunit Xampp

Actually, it can be updated in three simple steps:

1. Download the last version of PHPUnit here: https://phpunit.de/index.html
2. Copy “phpunit.phar” in “C:\xampp\php”.
3. In the file: “phpunit.bat”, update the following line: "%PHPBIN%" "C:\xampp\php\phpunit" %* to : "%PHPBIN%" "C:\xampp\php\phpunit.phar" %*

You don't need to restart apache.

Additional note: In your tests, you will need to replace: phpunit_framework_testcase by: TestCase

And include: use PHPUnit\Framework\TestCase at the top of your test files.

Of course, the test suites are still compatible on my production server (centos7, follow the official documentation to update on Linux https://phpunit.de/getting-started.html).