install(['test_theme']);
/** @var \Drupal\Core\Theme\ThemeInitializationInterface $theme_initializer */
$theme_initializer = \Drupal::service('theme.initialization');
/** @var \Drupal\Core\Theme\ThemeManagerInterface $theme_manager */
$theme_manager = \Drupal::service('theme.manager');
$theme_manager->setActiveTheme($theme_initializer->getActiveThemeByName('test_theme'));
// Create a mock field render array for a comment field.
$build = [
'#theme' => "field__{$fieldName}",
'#entity_type' => 'test',
'#bundle' => 'test',
'#field_name' => $fieldName,
'#label_display' => 'hidden',
'#field_type' => 'comment',
'#title' => 'test',
'#is_multiple' => FALSE,
0 => [
'#comment_type' => 'test',
'#comment_display_mode' => 'default',
'comments' => [
'#markup' => 'These are the comments.
',
],
'comment_form' => [
'#markup' => Markup::create(''),
],
],
];
$rendered = (string) \Drupal::service('renderer')->renderInIsolation($build);
// The "comments" and "comment_form" variables are injected by
// CommentThemeHooks::preprocessField() and should be correctly rendered by
// test_theme template using those variables.
$this->assertSame("These are the comments.
\n", $rendered);
}
}