Added unit tests for Workflow parsing functions

[timl3136]

What changed?
Added unit tests for Workflow parsing functions

Why?
Improve test coverage and stability

How did you test it?
Unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Merging #5860 (3d2cafc) into master (992b219) will increase coverage by 0.11%.
The diff coverage is n/a.

❗ Current head 3d2cafc differs from pull request most recent head b863ef8. Consider uploading reports for the commit b863ef8 to get more accurate results

Additional details and impacted files

see 5 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018eaa0d-1569-4dbc-84d0-b5b1d27b6da6

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 105 unchanged lines in 15 files lost coverage.
• Overall coverage decreased (-0.06%) to 66.152%

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Files with Coverage Reduction	New Missed Lines	%
service/history/task/transfer_standby_task_executor.go	2	87.42%
common/task/weighted_round_robin_task_scheduler.go	2	88.06%
common/persistence/sql/sqlplugin/postgres/task.go	2	73.4%
common/peerprovider/ringpopprovider/config.go	2	81.58%
common/persistence/sql/sqlplugin/postgres/db.go	2	80.0%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/matching/db.go	2	73.23%
service/matching/taskListManager.go	2	79.7%
service/history/execution/mutable_state_util.go	2	78.13%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%

Totals
Change from base Build 018ea9fa-e0f9-43b1-99e0-941d8e3527d8:	-0.06%
Covered Lines:	96805
Relevant Lines:	146337

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💛 - Coveralls