Compound appender tests

[gauntl3t12]

Hard code make_temp_file_name to 0 in the test config to allow for a consistent testing environment.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.15%. Comparing base (c981ca4) to head (7ae8409).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #355      +/-   ##
==========================================
+ Coverage   63.01%   66.15%   +3.14%     
==========================================
  Files          24       24              
  Lines        1560     1557       -3     
==========================================
+ Hits          983     1030      +47     
+ Misses        577      527      -50     

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