[improve][test] Add unit test for metadata cache #20363 #20436
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Motivation
This pr is follow suggestion from #20363 (comment), add unit test for #20363
Verifying this change
This change added tests and can be verified as follows:
MetadataStoreTest#testExistsDistributed
for distributed metaStore implementations onlyMetadataStoreTest#testGetChildrenDistributed
for distributed metaStore implementations onlyDoes this pull request potentially affect one of the following parts:
If the box was checked, please highlight the changes
Documentation
doc
doc-required
doc-not-needed
doc-complete
Matching PR in forked repository
PR in forked repository: Shawyeok#8