On 14.08.2006, at 10:47, stéphane ducasse wrote:

> read my joop paper. This is better explained. But I will send you  
> the paper so that you can compare :)
>


And have a look at BehaviorTest>>#testChange

testChange
	"self debug: #testChange"

	| behavior model |
	behavior := Behavior new.
	behavior superclass: Model.
	behavior setFormat: Model format.
	model := Model new.
	model primitiveChangeClassTo: behavior new.
	behavior compile: 'thisIsATest  ^ 2'.
	self assert: model thisIsATest = 2.
	self should: [Model new thisIsATest] raise: MessageNotUnderstood.



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