Add test asserting the report message

[schalkms]

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[codecov]

Codecov Report

Merging #3061 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #3061   +/-   ##
=========================================
  Coverage     79.30%   79.30%           
  Complexity     2563     2563           
=========================================
  Files           432      432           
  Lines          7725     7725           
  Branches       1466     1466           
=========================================
  Hits           6126     6126           
  Misses          814      814           
  Partials        785      785           

Impacted Files	Coverage Δ	Complexity Δ
...ekt/rules/style/optional/PreferToOverPairSyntax.kt	78.57% <100.00%> (ø)	5.00 <0.00> (ø)

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