Increase coverage

[lorenzwalthert]

This PR should increase the coverage of the project beyond 90%.

[codecov-io]

Codecov Report

Merging #412 into master will increase coverage by 1.92%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #412      +/-   ##
=========================================
+ Coverage   89.88%   91.8%   +1.92%     
=========================================
  Files          34      34              
  Lines        1572    1550      -22     
=========================================
+ Hits         1413    1423      +10     
+ Misses        159     127      -32

Impacted Files	Coverage Δ
R/rules-spacing.R	100% <ø> (+3.59%)	⬆️
R/reindent.R	100% <ø> (+24.52%)	⬆️
R/indent.R	100% <ø> (+3.4%)	⬆️
R/set-assert-args.R	92.3% <0%> (+19.23%)	⬆️
R/vertical.R	100% <0%> (+33.33%)	⬆️
R/communicate.R	100% <0%> (+33.33%)	⬆️

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