Fix up some of the test coverage.

[codecov-commenter]

Codecov Report

Merging #82 (30662a7) into master (644d698) will increase coverage by 1.43%. The diff coverage is 96.87%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   90.27%   91.70%   +1.43%     
==========================================
  Files          19       19              
  Lines        3907     3870      -37     
  Branches      747        0     -747     
==========================================
+ Hits         3527     3549      +22     
+ Misses        324      321       -3     
+ Partials       56        0      -56     

Impacted Files	Coverage Δ
vectorizers/linear_optimal_transport.py	92.95% <50.00%> (+2.42%)	:arrow_up:
vectorizers/tests/test_common.py	99.83% <100.00%> (+<0.01%)	:arrow_up:
vectorizers/tests/test_transformers.py	100.00% <100.00%> (ø)
vectorizers/transformers.py	95.42% <100.00%> (+2.03%)	:arrow_up:
vectorizers/utils.py	73.60% <0.00%> (-1.28%)	:arrow_down:
vectorizers/kde_vectorizer.py	91.93% <0.00%> (-0.13%)	:arrow_down:
vectorizers/ngram_vectorizer.py	86.44% <0.00%> (+0.84%)	:arrow_up:
vectorizers/coo_utils.py	92.22% <0.00%> (+1.26%)	:arrow_up:
... and 5 more

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[lmcinnes]

So something is weird here, and travis and coveralls didn't run, so ... um ... what?