assertOffCanvasBlockFormIsValid example

    $contextual_link = $this->assertSession()->waitForElement('css', "$contextual_link_container .contextual-links a");
    $this->assertNotEmpty($contextual_link);
    // When page first loads Edit Mode is not triggered until first contextual     // link is added.     $this->assertElementVisibleAfterWait('css', '.dialog-off-canvas-main-canvas.js-settings-tray-edit-mode');
    // Ensure that all other Ajax activity is completed.     $this->assertSession()->assertWaitOnAjaxRequest();
    $block = $this->getSession()->getPage()->find('css', $block_selector);
    $block->mouseOver();
    $block->click();
    $this->waitForOffCanvasToOpen();
    $this->assertOffCanvasBlockFormIsValid();
  }

  /** * Enables edit mode by pressing edit button in the toolbar. */
  protected function enableEditMode() {
    $this->pressToolbarEditButton();
    $this->assertEditModeEnabled();
  }

  /** * Disables edit mode by pressing edit button in the toolbar. */