Improve extensions for LegendDataManagement and refactor test output

[apmypb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 55.17%. Comparing base (73265f6) to head (a64f000).
Report is 13 commits behind head on dev.

❗ Current head a64f000 differs from pull request most recent head ee13600. Consider uploading reports for the commit ee13600 to get more accurate results

Files	Patch %	Lines
src/types.jl	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #41      +/-   ##
==========================================
+ Coverage   54.41%   55.17%   +0.76%     
==========================================
  Files           6        7       +1     
  Lines         634      792     +158     
==========================================
+ Hits          345      437      +92     
- Misses        289      355      +66     

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[oschulz]

Maybe change the title of this PR to something more descriptive? :-)