Add unit test for modeltest

[oinume]

No description provided.

[coveralls]

Coverage decreased (-7.3%) to 58.683% when pulling d77ef84 on modeltest-test into ceb358c on master.

[codecov-io]

Codecov Report

Merging #22 (d77ef84) into master (ceb358c) will decrease coverage by 7.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   61.53%   54.42%   -7.12%     
==========================================
  Files           4        5       +1     
  Lines         195      226      +31     
==========================================
+ Hits          120      123       +3     
- Misses         57       83      +26     
- Partials       18       20       +2     

Impacted Files	Coverage Δ
backend/modeltest/modeltest.go	9.67% <0.00%> (ø)

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