Issue #3368741: Drush build test symlinks drush and only passes because it loads classes not in build test project

package_manager/tests/src/Build/TemplateProjectTestBase.php

@@ -437,6 +437,14 @@ END;
           ],
           'autoload' => $package_info['autoload'] ?? [],
         ];
+        if (isset($package_info['require'])) {
+          foreach (array_keys($package_info['require']) as $package_name) {
+            if (str_starts_with($package_name, 'symfony/polyfill-')) {
+              unset($package_info['require'][$package_name]);
+            }
+          }
+          $packages[$name][$version]['require'] = $package_info['require'];
+        }
         // Composer plugins are loaded and activated as early as possible, and
         // they must have a `class` key defined in their `extra` section, along
         // with a dependency on `composer-plugin-api` (plus any other real