Refactor/test

[nasa9084]

for readability of test results, I refactor testing.
This PR includes:

• Use t.Run for subtest
• add label for table test

[codecov-io]

Codecov Report

Merging #159 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #159      +/-   ##
=========================================
+ Coverage   72.39%   72.5%   +0.11%     
=========================================
  Files          23      23              
  Lines        1782    1782              
=========================================
+ Hits         1290    1292       +2     
+ Misses        414     413       -1     
+ Partials       78      77       -1

Impacted Files	Coverage Δ
linebot/response.go	70.16% <0%> (+1.61%)	⬆️

---

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 8ebf117...0838a53. Read the comment docs.