Popusti list shortcode

// Add Shortcode
function popusti_shortcode( $atts ) {

	// Attributes
	extract( shortcode_atts(
		array(
			'tax_id' => '1',
		), $atts )
	);

	// Code
$output = '<ul>';
$the_query = new WP_Query( array ( 'posts_per_page' => $posts ) );
while ( $the_query->have_posts() ):
	$the_query->the_post();
	$output = '<li>' . get_the_title() . '</li>';
endwhile;
wp_reset_postdata();
$output = '</ul>';
return $output;

}
add_shortcode( 'popusti', 'popusti_shortcode' );