list custom post type entries by category

<?php
//list terms in a given taxonomy (useful as a widget for twentyten)
$taxonomy = 'productscat';
$tax_terms = get_terms($taxonomy);
?>
<ul>
<?php
foreach ($tax_terms as $tax_term) {
echo '<li>' . '<a href="' . esc_attr(get_term_link($tax_term, $taxonomy)) . '" title="' . sprintf( __( "View all posts in %s" ), $tax_term->name ) . '" ' . '>' . $tax_term->name.'</a></li>';
}
?>
</ul>


<?php
$args = array(
 'post_type' => 'products',
'category'	     => product-test-cat-1,
'posts_per_page' => -1,


 );
$loop = new WP_Query( $args );


while ( $loop->have_posts() ) : $loop->the_post();

?>

<a href="<?php the_permalink(); ?>"><?php the_title();?></a>

<?php	echo '<div class="entry-content">';
the_post_thumbnail('thumbnail');
the_excerpt();
	echo '</div>';
endwhile;
?>