Issue #3316318 by tedbow: Ensure release history fixture files are readable in build tests

automatic_updates_extensions/tests/src/Build/ModuleUpdateTest.php

@@ -21,7 +21,7 @@ class ModuleUpdateTest extends UpdateTestBase {
   protected function createTestProject(string $template): void {
     parent::createTestProject($template);
     $this->setReleaseMetadata([
-      'drupal' => __DIR__ . '/../../../../tests/fixtures/release-history/drupal.9.8.1-security.xml',
+      'drupal' => __DIR__ . '/../../../../package_manager/tests/fixtures/release-history/drupal.9.8.1-security.xml',
       'alpha'  => __DIR__ . '/../../fixtures/release-history/alpha.1.1.0.xml',
       'new_module' => __DIR__ . '/../../fixtures/release-history/new_module.1.1.0.xml',
     ]);

package_manager/tests/src/Build/TemplateProjectTestBase.php

@@ -167,6 +167,9 @@ END;
    * @see \Drupal\automatic_updates_test\TestController::metadata()
    */
   protected function setReleaseMetadata(array $xml_map): void {
+    foreach ($xml_map as $metadata_file) {
+      $this->assertFileIsReadable($metadata_file);
+    }
     $xml_map = var_export($xml_map, TRUE);
     $this->writeSettings("\$config['update_test.settings']['xml_map'] = $xml_map;");
   }