expect(strategy.cache.length).toBe(0); expect(strategy.getNodeIDByKey(345)).toBe("node-200"); expect(strategy.cache.length).toBe(1); }); strategy.ring.length = 0; expect(strategy.getNodeIDByKey(345)).toBe("node-200"); expect(strategy.cache.length).toBe(2); expect(strategy.getNodeIDByKey(456)).toBe(null); }); expect(strategy.cache.length).toBe(0); });