Add unit test for modeltest for coveralls

[oinume]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 542789620

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-7.3%) to 58.683%

---

Totals
Change from base Build 532888076:	-7.3%
Covered Lines:	196
Relevant Lines:	334

---

💛 - Coveralls

[codecov-io]

Codecov Report

Merging #23 (d77ef84) into master (ceb358c) will decrease coverage by 7.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- 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)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ceb358c...d77ef84. Read the comment docs.