setUpUnusedCache example

/** * @covers ::render * @covers ::doRender * * @dataProvider providerPlaceholders */
  public function testUncacheableParent($element, $args, array $expected_placeholder_render_array, $placeholder_cid_parts, array $bubbled_cache_contexts, array $bubbled_cache_tags, array $placeholder_expected_render_cache_array) {
    if ($placeholder_cid_parts) {
      $this->setupMemoryCache();
    }
    else {
      $this->setUpUnusedCache();
    }

    $this->setUpRequest('GET');

    // No #cache on parent element.     $element['#prefix'] = '<p>#cache disabled</p>';
    $output = $this->renderer->renderRoot($element);
    $this->assertSame('<p>#cache disabled</p><p>This is a rendered placeholder!</p>', (string) $output, 'Output is overridden.');
    $this->assertSame('<p>#cache disabled</p><p>This is a rendered placeholder!</p>', (string) $element['#markup'], '#markup is overridden.');
    $expected_js_settings = [
      'foo' => 'bar',