tests(environment): adding tests to environment package

[danielsuguimoto]

Relates to #20

[codecov]

Codecov Report

Merging #156 into master will increase coverage by 2.31%.
The diff coverage is 92.98%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   81.42%   83.73%   +2.31%     
==========================================
  Files          44       45       +1     
  Lines        1330     1353      +23     
==========================================
+ Hits         1083     1133      +50     
+ Misses        236      206      -30     
- Partials       11       14       +3     

Impacted Files	Coverage Δ
cmd/deploy.go	1.16% <0.00%> (ø)
cmd/shell/shell.go	0.00% <0.00%> (ø)
environment/env.go	81.25% <94.11%> (+81.25%)	⬆️
cmd/docker.go	100.00% <100.00%> (ø)
cmd/exec.go	100.00% <100.00%> (ø)
cmd/info.go	100.00% <100.00%> (ø)
cmd/run.go	100.00% <100.00%> (ø)
cmd/start.go	100.00% <100.00%> (ø)
cmd/status.go	100.00% <100.00%> (ø)
environment/asuser.go	100.00% <100.00%> (ø)
... and 5 more

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