enh: increase coverage

[mgxd]

bump up testing coverage, mainly for base and linear modules.

also adds a missing assertion for LTA test.

[codecov-io]

Codecov Report

Merging #23 into master will increase coverage by 4.83%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage    72.2%   77.04%   +4.83%     
==========================================
  Files          10       11       +1     
  Lines         734      758      +24     
  Branches       92       92              
==========================================
+ Hits          530      584      +54     
+ Misses        167      136      -31     
- Partials       37       38       +1

Flag	Coverage Δ
#unittests	77.04% <100%> (+4.83%)	⬆️

Impacted Files	Coverage Δ
nitransforms/linear.py	70.05% <ø> (+10.16%)	⬆️
nitransforms/tests/test_transform.py	85% <100%> (+2.24%)	⬆️
nitransforms/tests/test_io.py	100% <100%> (ø)	⬆️
nitransforms/tests/test_base.py	100% <100%> (ø)
nitransforms/base.py	73.03% <0%> (+12.35%)	⬆️

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