Add more test coverage for checkstyle

[prymitive]

No description provided.

[github-actions]

This pull request was validated by pint.

✔️ No problems found

Stats

Stat	Value
Version	v0.66.1-10-gf9e586f
Number of rules parsed	4
Number of rules checked	4
Number of problems found	0
Number of offline checks	0
Number of online checks	0
Checks duration	0

Problems

No problems reported

[github-actions]

Benchmark diff:

goos: linux
goarch: amd64
pkg: github.com/cloudflare/pint/cmd/pint
cpu: AMD EPYC 7763 64-Core Processor                
              │   old.txt   │              new.txt               │
              │   sec/op    │   sec/op     vs base               │
FindEntries-4   39.70m ± 5%   39.66m ± 1%       ~ (p=0.315 n=10)
CheckRules-4     8.503 ± 2%    8.521 ± 2%       ~ (p=0.481 n=10)
geomean         581.0m        581.3m       +0.05%

              │   old.txt    │               new.txt               │
              │     B/op     │     B/op      vs base               │
FindEntries-4   27.41Mi ± 0%   27.41Mi ± 0%       ~ (p=0.143 n=10)
CheckRules-4    977.5Mi ± 0%   977.0Mi ± 0%       ~ (p=0.280 n=10)
geomean         163.7Mi        163.6Mi       -0.02%

              │   old.txt   │              new.txt               │
              │  allocs/op  │  allocs/op   vs base               │
FindEntries-4   131.9k ± 0%   131.9k ± 0%  +0.00% (p=0.032 n=10)
CheckRules-4    14.19M ± 0%   14.19M ± 0%       ~ (p=0.247 n=10)
geomean         1.368M        1.368M       -0.01%

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.50000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.13%. Comparing base (f01f208) to head (f9e586f).

Files with missing lines	Patch %	Lines
internal/reporter/checkstyle.go	66.66%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1145      +/-   ##
==========================================
+ Coverage   95.01%   95.13%   +0.11%     
==========================================
  Files         103      103              
  Lines       10355    10350       -5     
==========================================
+ Hits         9839     9846       +7     
+ Misses        360      351       -9     
+ Partials      156      153       -3     

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