Tests for the stray lines needing coverage.

[agautam478]

What changed?
Added some extra test cases to increase coverage for some stray lines that were missed in previous PRs.

Why?
code coverage

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 70.08%. Comparing base (ab0d875) to head (723c0ec).
Report is 8 commits behind head on master.

Additional details and impacted files

see 19 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018fe51b-e6eb-4b35-9fd1-9ff51a8e73b0

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 766 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.4%) to 70.211%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	88.06%
common/task/fifo_task_scheduler.go	2	85.57%
service/matching/tasklist/matcher.go	2	89.35%
service/matching/tasklist/task_reader.go	2	77.72%
common/persistence/historyManager.go	2	66.67%
service/history/handler/handler.go	3	96.2%
service/history/engine/engineimpl/reset_sticky_tasklist.go	6	66.67%
service/history/engine/engineimpl/poll_mutable_state.go	9	74.16%
service/frontend/api/handler.go	24	65.45%
service/history/shard/context.go	52	69.17%

Totals
Change from base Build 018fe4fa-880c-4efc-b964-4cf1474664a6:	-0.4%
Covered Lines:	104579
Relevant Lines:	148950

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💛 - Coveralls