Tests: For handler: Register Domain in common/domain folder

[abhishekj720]

What changed?
Added tests for registerDomain for handler in common/domain

Why?
As part of test coverage week.

How did you test it?
Unit Test

Potential risks
Tests are written to avoid risks

[coveralls]

Pull Request Test Coverage Report for Build 018eaf70-3bd4-4eb7-87ea-a2b88e9de6d6

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 38 unchanged lines in 11 files lost coverage.
• Overall coverage increased (+0.007%) to 66.582%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
common/peerprovider/ringpopprovider/config.go	2	81.58%
common/task/fifo_task_scheduler.go	2	85.57%
service/history/task/transfer_active_task_executor.go	2	72.83%
common/util.go	2	91.78%
common/persistence/historyManager.go	2	66.67%
tools/cli/admin_db_decode_thrift.go	3	69.23%
service/history/queue/timer_gate.go	3	95.83%
service/history/task/fetcher.go	5	85.57%
service/history/execution/mutable_state_task_refresher.go	7	62.66%

Totals
Change from base Build 018eae75-8edb-4580-9ce6-f18a0f6bd028:	0.007%
Covered Lines:	97423
Relevant Lines:	146320

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💛 - Coveralls

[taylanisikdemir]

each table test should start fresh instead of reusing same handler. So I'd ditch the suite and make this a helper function to be called inside t.Run