[FLINK-13778] Improve convenience of TtlState in tests

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Not A Bug
• Affects Version/s: 1.8.0
• Component/s: Runtime / State Backends
• Assignee: Unassigned
• Reporter: YufeiLiu
• Created: 19/Aug/19 13:37
• Updated: 22/Aug/19 02:45
• Resolved: 22/Aug/19 02:45

Description

I have implement some new feature use TtlState，but I cant't construct a situation of state get expired in unit test, because expire time is System.currentTimeMillis by default.