Add test for NewHistoryReplicator in history_replicator.go

[bowenxia]

What changed?
add test for function NewHistoryReplicator in history_replicator.go

Why?
code coverage week

How did you test it?
unit test

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.56%. Comparing base (73e6dbc) to head (1d0c6a3).
Report is 5 commits behind head on master.

❗ Current head 1d0c6a3 differs from pull request most recent head 1e0405a. Consider uploading reports for the commit 1e0405a to get more accurate results

Additional details and impacted files

see 21 files with indirect coverage changes

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