On Sun, 27 May 2018, Max Leske wrote:

> Hi,
> Once again, there's a situation in the Fuel test suite that uncovered an issue. Consider the following script:
> 
> Object subclass: #Foo
> instanceVariableNames: ''
> classVariableNames: ''
> poolDictionaries: ''
> category: 'Kernel-Classes'.
> 10 timesRepeat: [(Smalltalk at: #Foo) rename: #Bar.
> (Smalltalk at: #Bar) rename: #Foo ]
> 
> In 5.2-alpha this will open a warning dialog, as at some point one of the class names will be undeclared. Class>>rename: only checks for an entry in the undeclared dictionary without considering that the weak
> references may not yet have been cleaned up.
> 
> I understand that this is not really a realistic real world use-case but it's still annoying for tests. My current workaround is a forced GC after *every* test in the entire suite (I use
> ClassFactoryForTestCase, so class names may be reused many times over). Luckily, the impact on runtime isn't too bad.

Did you consider extending ClassFactoryForTestCase with an optional infix 
name part for the generated names?
For example:

initialize

 	super initialize.
 	infix := ''.
 	self createdClasses: IdentitySet new

infix: aString

 	infix := aString

newName

 	^'ClassForTestToBeDeleted{1}{2}' format: {
 		infix.
 		self createdClasses size + 1 }

The you could specify a random infix, like UUID new asString36 to avoid 
collisions.

Levente

> 
> I'd appreciate it if this could be fixed. I'd be even more happy if I could be notified of the fix, so that I can remove the workaround again.
> 
> 
> Cheers,
> Max
> 
>