Custom Plugin – CSS works, JS doesn’t

Would you please try below code to your plugin page.
if the script file is your plugin root directory.

function plugin_adding_scripts() {
 wp_register_script('my_test_script', plugins_url('testscript.js', __FILE__), array('jquery'),'1.1', true);
 wp_enqueue_script('my_test_script');
}

 add_action( 'wp_enqueue_scripts', 'plugin_adding_scripts' );

Also: http://blog.aztora.com/add-css-js-into-wordpress-plugin/

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