unloading dynamically declared class in ruby

I have a class defined using theClass.class_eval and Object.const_set(className, theClass). Is there any way to remove the definition of this class? During testing I need to load different versions of the same class.

From stackoverflow

• Object.send(:remove_const, className) did the trick.

• I see that doing Object.send(:remove_const, className) prevent to reload the same class..

  how to reload?