Added tests to history_events.go.

[agautam478]

What changed?

• Covered all the branches and methods. The coverage should be 90% +

Why?
Code coevrage

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.95%. Comparing base (cb79fcc) to head (74341ea).
Report is 2 commits behind head on master.

Additional details and impacted files

see 10 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018f5980-bab2-4480-a8ea-58a80a8e70c9

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 74 unchanged lines in 14 files lost coverage.
• Overall coverage decreased (-0.02%) to 68.483%

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Files with Coverage Reduction	New Missed Lines	%
common/cache/lru.go	2	92.89%
common/task/fifo_task_scheduler.go	2	87.63%
service/matching/taskListManager.go	2	80.65%
common/membership/hashring.go	2	84.69%
common/persistence/historyManager.go	2	66.67%
service/history/task/transfer_standby_task_executor.go	3	87.45%
service/history/task/task.go	3	84.81%
common/persistence/statsComputer.go	3	96.07%
service/history/task/fetcher.go	4	85.05%
common/task/weighted_round_robin_task_scheduler.go	6	87.06%

Totals
Change from base Build 018f5920-e167-45cd-8901-b0a5fa3bbbfc:	-0.02%
Covered Lines:	100589
Relevant Lines:	146881

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💛 - Coveralls