phpunitHow to install PHPUnit from Packagist?

1. Install Composer if you don't have it already.
2. Create a composer.json file in the root of your project and add the following code:

{
    "require-dev": {
        "phpunit/phpunit": "^8.5"
    }
}

3. Run composer install in the root of your project.
4. Add the following line to your php.ini file:

zend_extension=xdebug.so

5. Run phpunit in the root of your project to verify the installation.

You should see the following output:

PHPUnit 8.5.2 by Sebastian Bergmann and contributors.

Usage:
  phpunit [options] UnitTest [UnitTest.php]
  phpunit [options] <directory>

...

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