Ted Bowman
--- a/tests/src/Build/CoreUpdateTest.php
+++ b/tests/src/Build/CoreUpdateTest.php
  public function testDrushUpdate(): void {
    $this->createTestProject('RecommendedProject');

-    $this->runComposer('composer require drush/drush', 'project');
+    $output = $this->runComposer('COMPOSER_MIRROR_PATH_REPOS=1 composer require drush/drush', 'project');
+    $this->assertStringNotContainsString('Symlinking', $output);
--- a/package_manager/tests/src/Build/TemplateProjectTestBase.php
+++ b/package_manager/tests/src/Build/TemplateProjectTestBase.php
        ];
+        if (isset($package_info['require'])) {
+          unset(
+            $package_info['require']['symfony/polyfill-php73'],
+            $package_info['require']['symfony/polyfill-php74'],
+            $package_info['require']['symfony/polyfill-php80'],
+            $package_info['require']['symfony/polyfill-php81'],
+          );
+          $packages[$name][$version]['require'] = $package_info['require'];
+        }
        // Composer plugins are loaded and activated as early as possible, and
        // they must have a `class` key defined in their `extra` section, along
        // with a dependency on `composer-plugin-api` (plus any other real
        // runtime dependencies).
        if ($packages[$name][$version]['type'] === 'composer-plugin') {
          $packages[$name][$version]['require'] = $package_info['require'] ?? [];
--- a/package_manager/tests/src/Build/TemplateProjectTestBase.php
+++ b/package_manager/tests/src/Build/TemplateProjectTestBase.php
      $this->runComposer('composer require --no-update drupal/core-vendor-hardening:*', $template_dir);
    }

+    // Do not run developement Composer plugin.
+    $this->runComposer("composer config allow-plugins.dealerdirect/phpcodesniffer-composer-installer false", $template_dir);