Issue #3318313: Make OverwriteExistingPackagesValidatorTest fixture less

package_manager/tests/src/Kernel/OverwriteExistingPackagesValidatorTest.php

@@ -30,10 +30,8 @@ class OverwriteExistingPackagesValidatorTest extends PackageManagerKernelTestBas
    *
    * The fixture simulates a scenario where the active directory has three
    * modules installed: module_1, module_2, and module_5. None of them are
-   * managed by Composer.
-   *
-   * The staging area has four modules: module_1, module_2, module_3, and
-   * module_5_different_path. All of them are managed by Composer.
+   * managed by Composer. These modules will be moved into the staging directory
+   * by the 'package_manager_bypass' module.
    */
   public function testNewPackagesOverwriteExisting(): void {
     $fixtures_dir = __DIR__ . '/../../fixtures/overwrite_existing_validation';
@@ -67,8 +65,9 @@ class OverwriteExistingPackagesValidatorTest extends PackageManagerKernelTestBas
       'install_path' => '../../modules/module_3',
     ]);
 
-    // module_4 doesn't exist in the active directory but exists in the staged
-    // directory will cause an error because its path collides with module_1.
+    // module_4 doesn't exist in the active directory but the 'install_path' as
+    // known to Composer in the staged directory collides with module_1 in the
+    // active directory which will cause an error.
     $this->addPackage($stage_dir, [
       'name' => 'drupal/module_4',
       'version' => '1.3.0',