Test some edge cases in detekt-api

[schalkms]

No description provided.

[codecov-io]

Codecov Report

Merging #2256 into master will increase coverage by 0.19%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master    #2256      +/-   ##
============================================
+ Coverage     81.26%   81.45%   +0.19%     
- Complexity     2101     2104       +3     
============================================
  Files           348      348              
  Lines          6020     6018       -2     
  Branches       1102     1102              
============================================
+ Hits           4892     4902      +10     
+ Misses          534      531       -3     
+ Partials        594      585       -9

Impacted Files	Coverage Δ	Complexity Δ
...rbosch/detekt/api/internal/CyclomaticComplexity.kt	94.33% <33.33%> (-0.21%)	23 <0> (ø)
...ain/kotlin/io/gitlab/arturbosch/detekt/api/Debt.kt	100% <0%> (+6.66%)	6% <0%> (ø)	⬇️
...in/io/gitlab/arturbosch/detekt/api/SplitPattern.kt	96.29% <0%> (+11.11%)	20% <0%> (+3%)	⬆️
...ch/detekt/api/internal/ValidatableConfiguration.kt	100% <0%> (+13.63%)	0% <0%> (ø)	⬇️
...io/gitlab/arturbosch/detekt/api/RuleSetProvider.kt	100% <0%> (+28.57%)	0% <0%> (ø)	⬇️

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[arturbosch]

Cool stuff, thanks!