[Pharo-project] how this test can be right

testAsCommaString {OrderedCollection new. Set new.} do: [ :coll | self assert: coll asCommaString = ''. coll add: 1. self assert: coll asCommaString = '1'. coll add: 2; add: 3. self assert: coll asCommaString = '1, 2, 3']. I was never said that elements are iterate in a set the same way that they are added. Stef