code: public static void stubMethod(Class<?> declaringClass, String methodName, Object returnObject) {
  		if (declaringClass == null) {
  			throw new IllegalArgumentException("declaringClass cannot be null");
  		}
  		if (methodName == null || methodName.length() == 0) {
  			throw new IllegalArgumentException("methodName cannot be empty");
  		}
  		Method[] methods = Whitebox.getMethods(declaringClass, methodName);
  		if (methods.length == 0) {
  			throw new MethodNotFoundException(String.format("Couldn't find a method with name %s in the class hierarchy of %s", methodName,
  					declaringClass.getName()));
  		} else if (methods.length > 1) {
  			throw new TooManyMethodsFoundException(String.format("Found %d methods with name %s in the class hierarchy of %s.", methods.length,
  					methodName, declaringClass.getName()));
  		}
  
  		MockRepository.putMethodToStub(methods[0], returnObject);
  	}
docs: Add a method that should be intercepted and return another value (
  {@code returnObject}) (i.e. the method is stubbed).