Increase test coverage

[dgageot]

No description provided.

[codecov-io]

Codecov Report

Merging #2225 into master will increase coverage by 0.6%.
The diff coverage is 68.42%.

@@           Coverage Diff            @@
##           master   #2225     +/-   ##
========================================
+ Coverage    58.1%   58.7%   +0.6%     
========================================
  Files         188     188             
  Lines        7869    7849     -20     
========================================
+ Hits         4572    4608     +36     
+ Misses       2924    2873     -51     
+ Partials      373     368      -5

Impacted Files	Coverage Δ
pkg/skaffold/kubernetes/wait.go	0% <0%> (ø)	⬆️
pkg/skaffold/kubernetes/watcher.go	100% <100%> (+100%)	⬆️
pkg/skaffold/util/util.go	77.03% <0%> (+1.48%)	⬆️
pkg/skaffold/runner/runner.go	70.73% <0%> (+1.62%)	⬆️
pkg/skaffold/util/tar.go	40.47% <0%> (+4.76%)	⬆️
cmd/skaffold/app/cmd/runner.go	52.63% <0%> (+5.26%)	⬆️
pkg/skaffold/test/test.go	100% <0%> (+12.9%)	⬆️

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