<?php

function looptest_shortcode($atts){
	extract( shortcode_atts( array(
		'expand' => '',
	), $atts) );
  ob_start();
$one = array(
  'post_type'   => 'post',
  'post_status' => 'publish'
	);
$the_query = new WP_Query($one); ?>
<?php while ($the_query -> have_posts()) : $the_query -> the_post(); the_title(); the_content(); endwhile; wp_reset_postdata(); return ob_get_clean();	?>
<?php }
add_shortcode('looptest_post', 'looptest_shortcode');