Testimonials Carousel in WordPress using Testimonials by WooThemes, Display Posts Shortcode and Slick jQuery. http://sridharkatakam.com/testimonials-carousel-wordpress-using-testimonials-woothemes-display-posts-shortcode-slick-jquery/

functions.php

//* Enqueue scripts and styles
add_action( 'wp_enqueue_scripts', 'enqueue_custom_scripts_styles' );
function enqueue_custom_scripts_styles() {

	wp_enqueue_style( 'dashicons' );

	wp_enqueue_style( 'slick-styles', get_stylesheet_directory_uri() . '/css/slick.css' );
	wp_enqueue_style( 'slick-theme-styles', get_stylesheet_directory_uri() . '/css/slick-theme.css' );
	
	wp_enqueue_script( 'slick-js', get_stylesheet_directory_uri() . '/js/slick.min.js', array( 'jquery' ), '1.3.15', true );
	
	wp_enqueue_script( 'slick-init', get_stylesheet_directory_uri() . '/js/slick-init.js', array( 'slick-js' ), '1.0.0', true );

}

//* Enable shortcodes in text widgets
add_filter( 'widget_text', 'do_shortcode' );

/**
* Customize opening outer markup of Display Posts Shortcode
* @author Bill Erickson
* @link http://wordpress.org/extend/plugins/display-posts-shortcode/
*
* @param $output string, the original opening markup
* @return $output string, the modified opening markup
*/
function be_display_posts_open( $output ) {
	$output = '<div class="testimonials-listing">';
	return $output;
}
add_filter( 'display_posts_shortcode_wrapper_open', 'be_display_posts_open' );

/**
* Customize closing outer markup of Display Posts Shortcode
* @author Bill Erickson
* @link http://wordpress.org/extend/plugins/display-posts-shortcode/
*
* @param $output string, the original closing markup
* @return $output string, the modified closing markup
*/
function be_display_posts_close( $output ) {
	$output = '</div>';
	return $output;
}
add_filter( 'display_posts_shortcode_wrapper_close', 'be_display_posts_close' ); 

/**
 * Add Read More link to Display Posts Shortcode plugin
 * @author Bill Erickson
 * @link http://wordpress.org/extend/plugins/display-posts-shortcode/
 *
 * @param string $output the original markup for an individual post
 * @param array $atts all the attributes passed to the shortcode
 * @param string $image the image part of the output
 * @param string $title the title part of the output
 * @param string $date the date part of the output
 * @param string $excerpt the excerpt part of the output
 * @param string $inner_wrapper what html element to wrap each post in (default is li)
 * @return string $output the modified markup for an individual post
 */
 
add_filter( 'display_posts_shortcode_output', 'be_display_posts_read_more', 10, 9 );
function be_display_posts_read_more( $output, $atts, $image, $title, $date, $excerpt, $inner_wrapper, $content, $class ) {

	// First check if an excerpt is included by looking at the shortcode $atts
	if ( $atts['include_excerpt'] )
		// Now let's rebuild the excerpt to include read more
		$excerpt = '<span class="excerpt">' . get_the_excerpt() . '<br /><br /><a class="more-link" href="' . get_permalink() . '">Read the full testimonial &raquo;</a></span>';
	else $excerpt = '';

	// Now let's rebuild the output. Only the excerpt changed so we're using the original $image, $title, and $date
	$output = '<' . $inner_wrapper . ' class="' . implode( ' ', $class ) . '">' . $image . $title . $date . $excerpt . $content . '</' . $inner_wrapper . '>';

	// Finally we'll return the modified output
	return $output;
}

gistfile1.txt

[display-posts post_type="testimonial" image_size="thumbnail" posts_per_page="10" wrapper="div" include_excerpt="true"]

slick-init.js

jQuery(document).ready(function($) {

	$('.testimonials-listing').slick({
		dots: true,
		slidesToShow: 2,
		slidesToScroll: 2,
		responsive: [
		{
		  breakpoint: 569,
		  settings: {
			slidesToShow: 1,
			slidesToScroll: 1
		  }
		},
		{
		  breakpoint: 481,
		  settings: {
		  	slidesToShow: 1,
			slidesToScroll: 1,
			dots: false
		  }
		}
	  ]
	});

});

style.css

/*
Testimonials Carousel
---------------------- */

.testimonials-listing {
	text-align: left;
}

.testimonials-listing .listing-item {
	padding: 40px;
}

.testimonials-listing .listing-item img {
	float: left;
	margin: 0 20px 10px 0;
}

.testimonials-listing .listing-item .title {
	display: block;
	margin-bottom: 20px;
	font-size: 30px;
	line-height: 1;
}

.testimonials-listing a {
	color: #22a1c4;
}

.testimonials-listing a:hover {
	color: #fff;
}

.testimonials-listing .slick-prev,
.testimonials-listing .slick-next {
	width: auto;
	height: auto;
}

.testimonials-listing .slick-prev:before,
.testimonials-listing .slick-next:before {
	display: inline-block;
	font: normal 30px/1 "dashicons";
	-webkit-font-smoothing: antialiased;
	vertical-align: top;
}

.testimonials-listing .slick-prev:before {
	content: "\f341";
}

.testimonials-listing .slick-next:before {
	content: "\f345";
}

.testimonials-listing .slick-dots li button:before,
.testimonials-listing .slick-dots li.slick-active button:before {
	color: #fff;
}

.image-section .testimonials-listing button:hover {
	border: none;
	background: transparent;
}