Issue #3182653 by longwave, Eli-T, devad: PHPUnit 9.4.3 Fatal error: Trait...

use Prophecy\PhpUnit\ProphecyTrait;

// @todo Replace with a proper dependency when we stop supporting PHPUnit 8.

if (!trait_exists(ProphecyTrait::class)) {

  print "Drupal requires Prophecy PhpUnit when using PHPUnit 9 or greater. Please use 'composer require --dev phpspec/prophecy-phpunit:^2' to ensure that it is present.\n";

  exit(1);

}

/**

 * Drupal's forward compatibility layer with multiple versions of PHPUnit.

 */