Run some tests sequentially

[lorenzwalthert]

Closes #1027.

[codecov-commenter]

Codecov Report

Merging #1031 (ddba306) into main (c6b978b) will decrease coverage by 0.12%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1031      +/-   ##
==========================================
- Coverage   91.20%   91.08%   -0.13%     
==========================================
  Files          46       46              
  Lines        2683     2691       +8     
==========================================
+ Hits         2447     2451       +4     
- Misses        236      240       +4     

Impacted Files	Coverage Δ
R/testing.R	66.66% <0.00%> (-1.95%)	⬇️
R/indent.R	100.00% <0.00%> (ø)
R/rules-line-breaks.R	100.00% <0.00%> (ø)

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[IndrajeetPatil]

Elegant solution. Thanks!

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 897884d is merged into main:

•   :ballot_box_with_check:cache_applying: 30.1ms -> 30.3ms [-0.89%, +2.04%]
•   :ballot_box_with_check:cache_recording: 802ms -> 798ms [-1.3%, +0.32%]
•   :ballot_box_with_check:without_cache: 1.98s -> 1.98s [-0.19%, +0.67%]

Further explanation regarding interpretation and methodology can be found in the documentation.