Add new unit test

[Shaddoll]

What changed?
Add new unit test

Why?

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 01839f03-aac7-4953-bdad-8c72dd8d8d65

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 99 unchanged lines in 14 files lost coverage.
• Overall coverage increased (+0.01%) to 57.343%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weightedRoundRobinTaskScheduler.go	2	89.12%
service/history/task/transfer_standby_task_executor.go	2	86.4%
service/matching/matcher.go	2	91.46%
service/matching/taskListManager.go	2	76.62%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	3	59.55%
common/task/fifoTaskScheduler.go	3	84.54%
common/persistence/serialization/parser.go	4	63.91%
common/persistence/serialization/thrift_decoder.go	4	57.14%
service/history/task/fetcher.go	4	91.24%
common/persistence/sql/workflowStateMaps.go	8	83.84%

Totals
Change from base Build 01839071-2167-4795-b408-8f0abe4fe530:	0.01%
Covered Lines:	85251
Relevant Lines:	148669

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💛 - Coveralls