Improve unit tests

[p-gw]

closes #10

TODO

• split up modifying tests between lts and latest
• Reconstruct 813998.lss for lts tests
• Fix Docker volumes for lts release

[codecov-commenter]

Codecov Report

Merging #14 (d305558) into main (a9e5c2e) will increase coverage by 46.46%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #14       +/-   ##
===========================================
+ Coverage   30.06%   76.52%   +46.46%     
===========================================
  Files          54       54               
  Lines         306      311        +5     
===========================================
+ Hits           92      238      +146     
+ Misses        214       73      -141     

Impacted Files	Coverage Δ
src/methods/release_session_key.jl	100.00% <ø> (+100.00%)	⬆️
src/CitrusAPI.jl	81.25% <100.00%> (+31.25%)	⬆️
src/methods/activate_tokens.jl	100.00% <100.00%> (+100.00%)	⬆️
src/methods/export_responses_by_token.jl	100.00% <100.00%> (+100.00%)	⬆️
src/methods/list_participants.jl	100.00% <100.00%> (+100.00%)	⬆️
src/utils.jl	80.00% <0.00%> (+6.66%)	⬆️
src/query.jl	100.00% <0.00%> (+9.09%)	⬆️
src/methods/set_survey_properties.jl	57.14% <0.00%> (+57.14%)	⬆️
... and 29 more

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