Add basic test for inspector by timvaillancourt · Pull Request #1166

Add basic test for inspector by timvaillancourt · Pull Request #1166 · github/gh-ost

This PR adds a simple test for the .getSharedUniqueKeys() func of go/logic/inspector.go

Also, the err error return was removed from .getSharedUniqueKeys() because it is never set

In case this PR introduced Go code changes:

contributed code is using same conventions as original code
script/cibuild returns with no formatting errors, build errors or unit test errors.