mock object and basic test cases for visibility single manager

[bowenxia]

What changed?
Add a mock file for visibility store
Add basic test cases for visibility single manager

Why?
for more code coverage

How did you test it?
unit test

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018e9bab-bec5-43fc-9e00-51c75f4a6a24

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 31 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.002%) to 65.273%

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Files with Coverage Reduction	New Missed Lines	%
service/history/task/transfer_standby_task_executor.go	2	86.6%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
service/history/shard/context.go	2	66.7%
common/task/parallel_task_processor.go	2	93.06%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/matching/db.go	2	73.23%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%
common/log/tag/tags.go	3	50.18%
common/task/fifo_task_scheduler.go	3	84.54%
service/history/queue/timer_queue_processor_base.go	3	77.82%

Totals
Change from base Build 018e9b7b-0946-4a2a-8777-4a7abded2d0f:	-0.002%
Covered Lines:	95517
Relevant Lines:	146334

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💛 - Coveralls

[codecov]

Codecov Report

Merging #5829 (b5b25c9) into master (e651195) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

Files	Coverage Δ
common/persistence/data_store_interfaces.go	100.00% <ø> (ø)
common/persistence/visibility_single_manager.go	3.67% <ø> (ø)

... and 5 files with indirect coverage changes

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