test for small fetch_* functions

[orbeckst]

more tests #6

[codecov]

Codecov Report

Merging #16 into master will increase coverage by 11.35%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #16       +/-   ##
===========================================
+ Coverage   57.64%   68.99%   +11.35%     
===========================================
  Files           8        8               
  Lines         229      229               
  Branches       26       26               
===========================================
+ Hits          132      158       +26     
+ Misses         96       68       -28     
- Partials        1        3        +2

Impacted Files	Coverage Δ
MDAnalysisData/adk_equilibrium.py	92.85% <0%> (+46.42%)	⬆️
MDAnalysisData/ifabp_water.py	92.85% <0%> (+46.42%)	⬆️

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