ENH: Write tests pulling up the coverage of base submodule

[oesteban]

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[codecov-io]

Codecov Report

Merging #28 into master will increase coverage by 4.98%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   79.39%   84.38%   +4.98%     
==========================================
  Files           5        5              
  Lines         398      397       -1     
  Branches       54       53       -1     
==========================================
+ Hits          316      335      +19     
+ Misses         62       42      -20     
  Partials       20       20

Flag	Coverage Δ
#unittests	84.38% <66.66%> (+4.98%)	⬆️

Impacted Files	Coverage Δ
nitransforms/base.py	96.62% <100%> (+23.51%)	⬆️
nitransforms/linear.py	69.78% <60%> (-0.81%)	⬇️

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