How to call a nested function in jquery plug ins

How to call a nested function in jquery plug ins

I've developed a plugin that has a few nested functions.
here is code :
(function( $ ){
  $.fn.myPlugin = function(options) {
 
    function applyCorner() {  // I want to test this.
  return true;
 } 




function someMethod(){
}
  };
})( jQuery );

 
I know I can test them by initiating the plugin, etc. but i want to test/call applyCorner() method alone.
 
Thanks in advance.