I got really confusing feedback on this topic.. I basically have friends:

-- who only had to take the driving test within one year (as rather expected)
-- who basically walked into one of the license offices, told the officer in charge they want to convert their DL , and it was done without any exam of any sorts although they have been in the country for more than a year in one case, more than two years in the other one.

-- who passed the one year limit but was very cheecky on the phone with the officer in charge and kinda got the conversion without the exam..

honestly, what is the rule? is it changing from canton to canton ? or based on the mood of the officer in charge that day??