Add unit tests for mutable_state_builder_methods_signal.go

[sankari165]

What changed?
unit tests added for mutable_state_builder_methods_signal.go

Why?
improve code coverage

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 67.76%. Comparing base (fb4bfce) to head (a0c80cf).
Report is 6 commits behind head on master.

Additional details and impacted files

see 18 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018fa9e3-7c7c-4a51-a84e-85f8669f2ae7

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 324 unchanged lines in 22 files lost coverage.
• Overall coverage decreased (-0.1%) to 69.294%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	88.06%
common/persistence/execution_manager.go	2	86.43%
service/matching/tasklist/task_list_manager.go	2	76.09%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/history/execution/mutable_state_builder.go	2	78.45%
service/history/execution/mutable_state_util.go	2	78.52%
common/persistence/statsComputer.go	2	97.14%
service/matching/tasklist/matcher.go	2	89.35%
service/matching/tasklist/task_reader.go	2	77.45%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%

Totals
Change from base Build 018fa77b-4f9b-42ed-a8a3-efd0d12a5a8a:	-0.1%
Covered Lines:	102095
Relevant Lines:	147336

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💛 - Coveralls