Myasuka opened a new pull request #11624: [FLINK-16949] Enhance 
AbstractStreamOperatorTestHarness to use customized TtlTimeProvider
URL: https://github.com/apache/flink/pull/11624
 
 
   ## What is the purpose of the change
   
   Enhance specific UTs to use customized `TtlTimeProvider` to simulate changed 
current time. This would introduce some changes to 
`AbstractStreamOperatorTestHarness` and add new 
`StreamTaskStateInitializerTestImpl` for different state backends.
   
   ## Brief change log
   Introduce some changes to `AbstractStreamOperatorTestHarness` and add new 
`StreamTaskStateInitializerTestImpl` for different state backends.
   
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
   AbstractStreamOperatorTestHarnessTest#testSetTtlTimeProvider
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not applicable
   

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