Add more unit test to history handler

[timl3136]

What changed?
Add more unit test to history handler

Why?
Improve test coverage and stability

How did you test it?
Unit test

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Merging #5897 (f085760) into master (1c7d522) will decrease coverage by 0.45%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

❗ Current head f085760 differs from pull request most recent head d6ee70f. Consider uploading reports for the commit d6ee70f to get more accurate results

Additional details and impacted files

see 41 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7cd0f80...d6ee70f. Read the comment docs.

[coveralls]

Pull Request Test Coverage Report for Build 018ef24a-037e-41b5-91cc-d62eaaa270cf

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 45 unchanged lines in 11 files lost coverage.
• Overall coverage increased (+0.03%) to 67.585%

---

Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/matching/taskListManager.go	2	80.46%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%
service/history/queue/timer_queue_processor_base.go	3	77.82%
service/history/queue/timer_gate.go	3	95.83%
common/persistence/statsComputer.go	3	96.79%
service/history/task/transfer_standby_task_executor.go	4	86.6%
common/persistence/nosql/nosql_task_store.go	5	61.95%
common/task/fifo_task_scheduler.go	5	84.54%

Totals
Change from base Build 018eeeee-9517-449e-b456-d07d85466364:	0.03%
Covered Lines:	98928
Relevant Lines:	146376

---

💛 - Coveralls