doTestEmptyStorage example

protected function setUp(): void {
    parent::setUp();

    $this->treeStorage = new MenuTreeStorage($this->container->get('database'), $this->container->get('cache.menu'), $this->container->get('cache_tags.invalidator'), 'menu_tree');
    $this->connection = $this->container->get('database');
  }

  /** * Tests the tree storage when no tree was built yet. */
  public function testBasicMethods() {
    $this->doTestEmptyStorage();
    $this->doTestTable();
  }

  /** * Ensures that there are no menu links by default. */
  protected function doTestEmptyStorage() {
    $this->assertEquals(0, $this->treeStorage->countMenuLinks());
  }

  /** * Ensures that table gets created on the fly. */