Write tests for cassandra SelectWorkflowExecution

[taylanisikdemir]

What changed?

• Added unit tests for cassandra plugin's SelectWorkflowExecution
• Minor refactoring on other test cases based on feedback

Why?

• Improve coverage

[codecov]

Codecov Report

Merging #5792 (360a1ea) into master (3091e41) will increase coverage by 0.12%.
The diff coverage is n/a.

Additional details and impacted files

see 4 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018e4fc1-ee35-4870-9cd7-4fcaab7089ed

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 17 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+0.04%) to 64.919%

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Files with Coverage Reduction	New Missed Lines	%
service/matching/taskReader.go	2	84.88%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
common/peerprovider/ringpopprovider/config.go	2	81.58%
service/history/task/transfer_active_task_executor.go	2	72.51%
common/membership/hashring.go	2	82.23%
common/persistence/statsComputer.go	3	93.57%
service/history/queue/timer_queue_processor_base.go	4	77.62%

Totals
Change from base Build 018e43c7-e893-4c40-a63b-442d9dceb207:	0.04%
Covered Lines:	94761
Relevant Lines:	145968

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💛 - Coveralls