gistfile1.php

add_shortcode( 'newsPost_block',  'newsPost_block_func');
global $post;
function newsPost_block_func() {
  $html = '';
  $args = array(
      'posts_per_page' => 1
  );

  $query = new WP_Query($args);

  var_dump($query->have_posts());
  if ($query->have_posts()) {
      while ($query->have_posts()) {
          $query->the_post;
          $html .= the_content();
      }
  }
  return $html;
}