[code-coverage] Tests for Decision taskHandler

[ketsiambaku]

What changed?

• Added more tests for taskHandler functions
• I'm Using handleDecisions() function in tests since it's lower in the call stack. This way we'll cover the switch statement in handleDecisions() as well as the different switch cases
• Added comments for constants

Why?
improve code coverage in service/history/decision

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 63.95%. Comparing base (b4481d8) to head (6c281fa).

Additional details and impacted files

see 10 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018f3330-471d-4f16-bef1-993f9e9c248f

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 31 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.07%) to 68.136%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	1	89.05%
common/persistence/execution_manager.go	2	83.74%
common/task/fifo_task_scheduler.go	2	85.57%
common/util.go	2	91.78%
service/matching/taskListManager.go	2	80.65%
common/persistence/statsComputer.go	2	97.14%
service/history/task/transfer_standby_task_executor.go	4	86.21%
service/history/execution/mutable_state_task_refresher.go	7	62.03%
service/history/shard/context.go	9	69.08%

Totals
Change from base Build 018f3227-822d-447c-be93-57b83bc265d9:	0.07%
Covered Lines:	100045
Relevant Lines:	146831

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💛 - Coveralls