mouseOver example

    // Ensure that contextual link element is present because this is required     // to open the off-canvas dialog in edit mode.     $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();
  }

// Open block form by clicking an element inside the block.     // This confirms that default action for links and form elements is     // suppressed.     $this->openBlockForm("$block_selector {$element_selector}", $block_selector);
    $web_assert->elementTextContains('css', '.contextual-toolbar-tab button', 'Editing');
    $web_assert->elementAttributeContains('css', '.dialog-off-canvas-main-canvas', 'class', 'js-settings-tray-edit-mode');
    // Simulate press the Escape key.     $this->getSession()->executeScript('jQuery("body").trigger(jQuery.Event("keyup", { keyCode: 27 }));');
    $this->waitForOffCanvasToClose();
    $this->getSession()->wait(100);
    $this->getSession()->getPage()->find('css', static::TOOLBAR_EDIT_LINK_SELECTOR)->mouseOver();
    $this->assertEditModeDisabled();
    $this->assertNotEmpty($web_assert->waitForElement('css', '#drupal-live-announce:contains(Exited edit mode)'));
    $web_assert->assertNoElementAfterWait('css', '.contextual-toolbar-tab button:contains(Editing)');
    $web_assert->elementAttributeNotContains('css', '.dialog-off-canvas-main-canvas', 'class', 'js-settings-tray-edit-mode');

    // Clean up test data so each test does not impact the next.     $block->delete();
    if ($permissions) {
      user_role_revoke_permissions(Role::AUTHENTICATED_ID, $permissions);
    }
  }