assertHighlightNotExists example

$page->clickLink('Two column');
    $this->assertNotEmpty($assert_session->waitForElementVisible('css', '#drupal-off-canvas input[type="submit"][value="Add section"]'));
    $assert_session->assertWaitOnAjaxRequest();

    // The highlight is present with ConfigureSectionForm.     $this->assertHighlightedElement('[data-layout-builder-highlight-id="section-0"]');

    // Submit the form to add the section and then confirm that no element is     // highlighted anymore.     $page->pressButton("Add section");
    $assert_session->assertWaitOnAjaxRequest();
    $this->assertHighlightNotExists();
    $this->assertNotEmpty($assert_session->waitForElementVisible('css', '[data-layout-delta="1"]'));
    $assert_session->elementsCount('css', '.layout-builder__add-block', 3);

    // Add a content block.     $page->clickLink('Add block');
    $this->assertNotEmpty($assert_session->waitForElementVisible('css', 'a:contains("Create content block")'));
    $assert_session->assertWaitOnAjaxRequest();

    // Highlight is present with ChooseBlockController::build().     $this->assertHighlightedElement('[data-layout-builder-highlight-id="block-0-first"]');
    $page->clickLink('Create content block');