carterkozak edited a comment on pull request #655:
URL: https://github.com/apache/logging-log4j2/pull/655#issuecomment-1000906261


   > Woa, aren't we missing unit tests that exercise those lookups?
   
   I think the issue is abundance of branches.
   
   The non-plugin constructor is used initially when the configuration is 
created to interpolate the Property values themselves, then the interpolator is 
replaced with one which does use plugins. Existing uses of 
`config.getStrSubstitutor()` would work fine, while `new StrSubstitutor()` and 
some overloads would not.


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