testimonials

// WP_Query arguments
$args = array(
	'post_type'              => array( 'testimonials' ),
	'post_status'            => array( 'publish' ),
	'order'                  => 'DESC',
	'orderby'                => 'date',
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'testimonials_type',
			'value'   => 'library',
			'compare' => '=',
			'type'    => 'CHAR',
		),
	),
);

// The Query
$librariansquery = new WP_Query( $args );

// The Loop
if ( $librariansquery->have_posts() ) {
	while ( $librariansquery->have_posts() ) {
		$librariansquery->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();