How do I pass a string within an object literal in JS?

I have just learned about code organization with object literals, but I haven't been able to figure out how to pass a string variable within an object literal. This is my code kind of looks like:

var foo = {
    onReady : function() {
        $( '.adiv' ).click( foo.action( 'test' ) );
    }
    action : function( x ) {
        alert( x );
    }
jQuery( function($){
    foo.onReady();
});