NOISSUE - Add missing user service tests

[mteodor]

Signed-off-by: Mirko Teodorovic mirko.teodorovic@gmail.com

What does this do?

add missing user service tests

[codecov-io]

Codecov Report

Merging #945 into master will increase coverage by 1.22%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #945      +/-   ##
==========================================
+ Coverage   82.43%   83.65%   +1.22%     
==========================================
  Files          75       75              
  Lines        5244     5244              
==========================================
+ Hits         4323     4387      +64     
+ Misses        661      590      -71     
- Partials      260      267       +7

Impacted Files	Coverage Δ
users/service.go	84.61% <100%> (+58.97%)	⬆️
users/api/http/transport.go	80.85% <0%> (+2.83%)	⬆️
users/api/http/requests.go	60% <0%> (+6.66%)	⬆️
users/api/http/endpoint.go	82.6% <0%> (+8.69%)	⬆️
users/api/http/responses.go	75% <0%> (+25%)	⬆️

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[drasko]

LGTM