get_template_directory_uri()
get_template_directory()
get_stylesheet_directory_uri()
get_stylesheet_directory()

// Pattern 1
wp_enqueue_script( 'test-1', get_template_directory_uri() . '/js/test-1.js', 'jquery', '20120206', true );
wp_enqueue_script( 'test-2', get_template_directory_uri() . '/js/test-2.js', 'jquery', '20120206', true );
wp_enqueue_script( 'test-3', get_template_directory_uri() . '/js/test-3.js', 'jquery', '20120206', true );

// Pattern 2
$template_directory_uri = get_template_directory_uri();
wp_enqueue_script( 'test-1', $template_directory_uri . '/js/test-1.js', 'jquery', '20120206', true );
wp_enqueue_script( 'test-2', $template_directory_uri . '/js/test-2.js', 'jquery', '20120206', true );
wp_enqueue_script( 'test-3', $template_directory_uri . '/js/test-3.js', 'jquery', '20120206', true );

// Pattern 3
define( 'THEME_URI', get_template_directory_uri() );
define( 'THEME_JS', trailingslashit( BASETHEME_THEME_URI ) . 'js/' );
// Then, later on...
wp_enqueue_script( 'test-1', THEME_JS . 'test-1.js', 'jquery', '20120206', true );
wp_enqueue_script( 'test-2', THEME_JS . 'test-2.js', 'jquery', '20120206', true );
wp_enqueue_script( 'test-3', THEME_JS . 'test-3.js', 'jquery', '20120206', true );

// ...sample code from _s using the multiple calls to get_template_directory_uri()
/**
 * Enqueue scripts and styles
 */
function _s_scripts() {
    global $post;

    wp_enqueue_style( 'style', get_stylesheet_uri() );

    wp_enqueue_script( 'jquery' );

    wp_enqueue_script( 'small-menu', get_template_directory_uri() . '/js/small-menu.js', 'jquery', '20120206', true );

    if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
        wp_enqueue_script( 'comment-reply' );
    }

    if ( is_singular() && wp_attachment_is_image( $post->ID ) ) {
        wp_enqueue_script( 'keyboard-image-navigation', get_template_directory_uri() . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20120202' );
    }
}
add_action( 'wp_enqueue_scripts', '_s_scripts' );

function _s_scripts() {
    global $post;
    wp_enqueue_style( 'style', get_stylesheet_uri() );
    wp_enqueue_script( 'jquery' );
    $get_template_directory_uri = get_template_directory_uri();
    wp_enqueue_script( 'small-menu',  $get_template_directory_uri. '/js/small-menu.js', 'jquery', '20120206', true );
    if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
        wp_enqueue_script( 'comment-reply' );
    }
    if ( is_singular() && wp_attachment_is_image( $post->ID ) ) {
        wp_enqueue_script( 'keyboard-image-navigation', $get_template_directory_uri . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20120202' );
    }
}
add_action( 'wp_enqueue_scripts', '_s_scripts' );