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Merging #5113 (e8fdf37) into master (7f3fba9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master    #5113   +/-   ##
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  Coverage   99.53%   99.53%           
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  Files          76       76           
  Lines       14448    14459   +11     
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+ Hits        14381    14392   +11     
  Misses         67       67           

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However, we can't add a |> test to that because |> depends on R>4.1.0 and any sort of conditional like that will change the scripts output (autoprint.Rout) which gets compared against the fixed autoprint.Rout.save

There is a trick I did in cat tests/knitr.R

if (suppressPackageStartupMessages(requireNamespace("knitr", quietly = TRUE))) {
    require(knitr)
    knit("knitr.Rmd", quiet=TRUE)
    cat(readLines("knitr.md"), sep="\n")
    invisible(file.remove("knitr.md"))
} else {
    cat(readLines("knitr.Rout.mock", warn = FALSE), sep="\n")
}

and then mock file is just expected output. So in this case instead of requireNamespace we can test R version, and cat(readLines()) expected output from 4.1+ on older R versions.

We can also use .Rin files I believe:

Test code can either be provided directly in a .R (or .r as from R 3.4.0) file, or via a .Rin file containing code which in turn creates the corresponding .R file

https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Package-subdirectories