The oldest cryptocurrency’s push past $20,000 has turned the market mood more bullish. Bitcoin’s 5.6% gain since Sunday represents the biggest weekly gain in three months. But the crucial test will come next week when the Federal Reserve’s Federal Open Market Committee meets. Most traders expect the U.S. central bank to raise the main interest rate by 75 basis points (0.75 percentage point), but the drama is likely to come from whatever Fed Chair Jerome Powell signals about the committee’s plans for its December meeting.