public static function wpSetUpBeforeClass() {
    // Set up custom template post.
    $args       = array(
      'post_type'    => 'wp_template',
      'post_name'    => 'wp-custom-template-my-block-template',
      'post_title'   => 'My Custom Block Template',
      'post_content' => 'Content',
      'post_excerpt' => 'Description of my block template',
      'tax_input'    => array(
        'wp_theme' => array(
          get_stylesheet(),
        ),
      ),
    );
    self::$post = self::factory()->post->create_and_get( $args );
    wp_set_post_terms( self::$post->ID, get_stylesheet(), 'wp_theme' );
  }