add test cases

[zhuangya]

No description provided.

[codecov]

Codecov Report

Merging #306 into master will increase coverage by 0.71%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
+ Coverage   96.21%   96.92%   +0.71%     
==========================================
  Files          27       28       +1     
  Lines         132      130       -2     
  Branches       39       38       -1     
==========================================
- Hits          127      126       -1     
+ Misses          4        3       -1     
  Partials        1        1

Impacted Files	Coverage Δ
src/utils/flattenWhenNode.js	100% <ø> (ø)	⬆️
src/handleActions.js	100% <ø> (ø)	⬆️
src/utils/unflattenActionCreators.js	100% <ø> (ø)	⬆️
src/utils/get.js	100% <100%> (ø)
src/utils/camelCase.js	100% <100%> (ø)	⬆️
src/combineActions.js	100% <0%> (+14.28%)	⬆️

---

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 796368c...d88bc04. Read the comment docs.

[timche]

Thanks a lot!