Issue #3230507: Create build tests for case where site is using core recommended Composer project

tests/src/Build/AttendedCoreRecommendedUpdateTest.php

@@ -47,7 +47,7 @@ class AttendedCoreRecommendedUpdateTest extends AttendedCoreUpdateTest {
    *   The path of the mocked package.
    */
   protected function createTargetMetapackage(string $version): string {
-    $destination = $this->mockPackage($this->getDrupalRoot() . '/composer/Metapackage/CoreRecommended');
+    $destination = $this->copyPackage($this->getDrupalRoot() . '/composer/Metapackage/CoreRecommended');
 
     $this->alterPackage($destination, [
       'version' => $version,