Add unit test for frontend/admin/handler - part 1

[neil-xie]

What changed?
Add more unit test for frontend/admin/handler

Why?

How did you test it?

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.45%. Comparing base (73e6dbc) to head (04c29e4).
Report is 2 commits behind head on master.

Additional details and impacted files

see 20 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018f5a38-f8aa-48fe-92c9-81131e5fabd9

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 280 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.1%) to 68.625%

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Files with Coverage Reduction	New Missed Lines	%
service/history/queue/timer_queue_processor_base.go	1	78.28%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
common/task/fifo_task_scheduler.go	2	85.57%
service/matching/taskListManager.go	2	81.16%
service/matching/matcher.go	2	90.72%
service/history/execution/mutable_state_util.go	2	78.52%
service/history/task/timer_standby_task_executor.go	3	85.63%
service/history/task/transfer_standby_task_executor.go	4	86.83%
service/history/task/fetcher.go	4	85.05%
service/history/engine/engineimpl/history_engine.go	12	82.94%

Totals
Change from base Build 018f59eb-9a95-48c7-ad8f-8dec79b24f38:	0.1%
Covered Lines:	100797
Relevant Lines:	146881

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💛 - Coveralls

[davidporter-id-au]

These are really easy to read tests, it's really nice to review