Test for pages using a specific Page Template

gistfile1.txt

function test_for_page_template() {
	$args = array(
		'post_type'  => 'page',
		'meta_query' => array(
			array(
				'key'   => '_wp_page_template',
				'value' => 'PAGETEMPLATE.php'
			)
		)
	);
	$query = new WP_Query( $args );
	
	dump_and_die($query);
}
add_action('init', 'test_for_page_template');