issue/3460654: Moved testAdminRoute() to testFieldUIRoutes() to improves test performance.

core/modules/field_ui/tests/src/Functional/FieldUIRouteTest.php

@@ -40,6 +40,11 @@ protected function setUp(): void {
    * Ensures that entity types with bundles do not break following entity types.
    */
   public function testFieldUIRoutes(): void {
+    $route = \Drupal::service('router.route_provider')->getRouteByName('entity.entity_test.field_ui_fields');
+    $is_admin = \Drupal::service('router.admin_context')->isAdminRoute($route);
+    // Asserts that admin routes are correctly marked as such.
+    $this->assertTrue($is_admin, 'Admin route correctly marked for "Manage fields" page.');
+
     $this->drupalLogin($this->drupalCreateUser([
       'administer account settings',
       'administer entity_test_no_id fields',
@@ -126,13 +131,4 @@ public function assertLocalTasks(): void {
     $this->assertSession()->linkExists('Manage form display');
   }
 
-  /**
-   * Asserts that admin routes are correctly marked as such.
-   */
-  public function testAdminRoute(): void {
-    $route = \Drupal::service('router.route_provider')->getRouteByName('entity.entity_test.field_ui_fields');
-    $is_admin = \Drupal::service('router.admin_context')->isAdminRoute($route);
-    $this->assertTrue($is_admin, 'Admin route correctly marked for "Manage fields" page.');
-  }
-
 }