Added test for split_vector() from utils.R.

[hxxr]

[codecov[bot]]

Codecov Report

Merging #310 into master will decrease coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #310      +/-   ##
==========================================
- Coverage   78.98%   78.93%   -0.05%     
==========================================
  Files          39       38       -1     
  Lines        2398     2293     -105     
==========================================
- Hits         1894     1810      -84     
+ Misses        504      483      -21

Impacted Files	Coverage Δ
src/HashCorpus.cpp	66.21% <0%> (-2.92%)	:arrow_down:
R/model_GloVe.R	58.11% <0%> (-1.39%)	:arrow_down:
src/GloveFitter.cpp	70.37% <0%> (-1.3%)	:arrow_down:
R/tcm.R	85.89% <0%> (-1.01%)	:arrow_down:
R/iterators.R	77.7% <0%> (-0.69%)	:arrow_down:
R/model_LSA.R	73.68% <0%> (-0.68%)	:arrow_down:
R/vectorizers.R	90.47% <0%> (-0.64%)	:arrow_down:
src/VocabCorpus.cpp	91.83% <0%> (-0.62%)	:arrow_down:
src/utils.cpp	55.93% <0%> (-0.52%)	:arrow_down:
R/vocabulary.R	85.4% <0%> (-0.52%)	:arrow_down:
... and 18 more

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[dselivanov]

@hxxr thanks for your contribution - PR with test coverage are especially appreciated. Let me know when this will be ready for review.