[Pharo-project] UTF converter fails to read tildes and ñ

I've written the following test, which is failing. testReadñCharacter | converter | converter := UTF8TextConverter new. self assert: 'ñ' equals: (converter nextFromStream: 'ñ' readStream). I attach a changeset with that test. Am I ok or UTF8TextConverter is behaving wrong? Thanks, Guille