Add unit tests for replay logger

[Shaddoll]

What changed?
Add unit tests for replay logger

Why?
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 73.10%. Comparing base (606808c) to head (9d720a3).
Report is 1 commits behind head on master.

Additional details and impacted files

see 6 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 26d90e1...9d720a3. Read the comment docs.

[coveralls]

Pull Request Test Coverage Report for Build 2614

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.9%) to 79.053%

---

Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/uber/cadence/internal/sync/CancellationScopeImpl.java	1	92.65%
src/main/java/com/uber/cadence/internal/testservice/TestWorkflowMutableStateImpl.java	1	85.33%

Totals
Change from base Build 2612:	0.9%
Covered Lines:	15326
Relevant Lines:	19387

---

💛 - Coveralls