Inflation tests ahead, currencies often not cooperating

By Ross Finley LONDON (Reuters) - With the world economy entering a more uncertain phase and the top central banks sounding ever more cautious, attention may turn in the coming week to signs of whether years of aggressive stimulus have yielded any significant rise in inflation. The U.S. Federal Reserve, the Bank of England and the European Central Bank all have been disappointed to varying degrees about how little inflation has picked up, or indeed how it has spent too much time going the opposi