Issue #2793091 by alexpott, neclimdul: Refactor EntityFile "unit" test fails

core/modules/migrate/tests/src/Unit/process/CopyFileTest.php → core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php

 <?php
 
-namespace Drupal\Tests\migrate\Unit\process;
+namespace Drupal\Tests\migrate\Kernel\process;
 
 use Drupal\Core\StreamWrapper\StreamWrapperInterface;
 use Drupal\KernelTests\Core\File\FileTestBase;