Add test cases for cli/runners package

[schalkms]

No description provided.

[codecov-io]

Codecov Report

Merging #2381 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2381      +/-   ##
============================================
+ Coverage     82.73%   82.82%   +0.09%     
- Complexity     2135     2138       +3     
============================================
  Files           352      352              
  Lines          6080     6080              
  Branches       1109     1109              
============================================
+ Hits           5030     5036       +6     
+ Misses          480      475       -5     
+ Partials        570      569       -1

Impacted Files	Coverage Δ	Complexity Δ
.../arturbosch/detekt/cli/runners/SingleRuleRunner.kt	97.22% <0%> (+8.33%)	8% <0%> (+2%)	⬆️
...ab/arturbosch/detekt/cli/runners/ConfigExporter.kt	80% <0%> (+60%)	2% <0%> (+1%)	⬆️

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