fix issue #4

[holicc]

Fixes # Fix #4 add some test for service.file

[codecov[bot]]

Codecov Report

Merging #32 into master will decrease coverage by 27.97%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #32       +/-   ##
===========================================
- Coverage   68.29%   40.31%   -27.98%     
===========================================
  Files           2        6        +4     
  Lines          82      191      +109     
===========================================
+ Hits           56       77       +21     
- Misses         22      110       +88     
  Partials        4        4               

Impacted Files	Coverage Δ
service/file.go	31.25% <100.00%> (ø)
service/folder.go	0.00% <0.00%> (ø)
service/user.go	0.00% <0.00%> (ø)
service/matter.go	29.72% <0.00%> (ø)

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[saltbo]

http://jartto.wang/2018/12/11/git-rebase/