Hi, maybe I am missing something fundamental, because this seems like an obvious scenario I have a class Something with two methods Something>>askForName ^ UIManager default request: 'Name' Something>>name ^ self askForName , ' suffix' Now I want to mock out askForName, so I can run it automatically in tests... I've tried just stubbing it... SomethingTest>>testRenameStub Something stub askForName willReturn: 'new'. Something new name should be: 'new suffix' however it still opens the window to ask for the name, so the original method is being called. Right now I have to stub it with metalinks, which doesn't play well with some tools (hapao) SomethingTest>>testRenameMeta | link newName | link := MetaLink new metaObject: [ 'new' ]; control: #instead. (Something >> #askForName) ast link: link. [ newName := Something new name ] ensure: [ link uninstall ]. self assert: newName equals: 'new suffix' Thanks, Peter