Query multiple custom post types in single loop

multiposttype

 <?php
          $args = array(
    'post_type' => array('testimonial', 'other_post_type', 'another-post-type'),
    'posts_per_page' => 1,
    'tax_query' => array(
        array ( 
                'taxonomy' => 'testimonial_category',
                'field' => 'slug',
                'terms' => 'home'
    )
)
);
$query = new WP_Query( $args );
                $postcount = 0;
            ?>
            <?php if ($query->have_posts()) : ?>
                <?php while ($query->have_posts()) : $query->the_post(); ?>
                    <?php $postcount++; ?>
//loop here
<?php wp_reset_query(); ?>