`covr` does not register `tinysnapshot` tests

Summary

covr::package_coverage does not register the coverage of functions run by tinysnapshot via tinytest

Steps to Reproduce

• Set up a minimal package with tinytest testing.
• Add a simple base-r plotting function.
• Add a test of your function using tinysnapshot.
• Run covr::package_coverage.

Expected behavior: Plotting function shown as covered. Actual behavior: Plotting function shown as not covered.

MRE

I've set up such a simple package here: https://github.com/katrinabrock/minimal-r-package/tree/main/inner-pkgs/myinnerpkg

Script to reproduce here: https://github.com/katrinabrock/minimal-r-package/blob/7c54e0bf7937f070ee483d51685bd83ea8566f04/covr-tinysnapshot-incompatibility.R

More Details

Running the test script directly with covr::file_coverage does result in the coverage properly being registered. Based on my tests, things only break when tinytest::run_dir or tinytest::run_package are involved.

I'm not 100% sure that this issue is with tinysnapshot and not with covr or tinytest, but I have to start somewhere. For non-tinysnapshot tests, covr and tinytest seem to work together fine.

In other words,

• tinytest + covr -> coverage reported correctly
• tinysnapshot + covr -> coverage reported correctly
• tinytest + tinysnapshot + covr -> coverage not reported

[ins] r$> sessionInfo()
R version 4.5.0 (2025-04-11)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 24.04.2 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3 
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.26.so;  LAPACK version 3.12.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=de_DE.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=de_DE.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=de_DE.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=de_DE.UTF-8 LC_IDENTIFICATION=C       

time zone: Europe/Berlin
tzcode source: system (glibc)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] myinnerpkg_1.0     tinysnapshot_0.2.0 tinytest_1.4.1    

loaded via a namespace (and not attached):
 [1] digest_0.6.39      magrittr_2.0.4     pkgload_1.4.0      fastmap_1.2.0     
 [5] rprojroot_2.1.1    jsonlite_2.0.0     processx_3.8.6     pkgbuild_1.4.8    
 [9] sessioninfo_1.2.3  brio_1.1.5         urlchecker_1.0.1   ps_1.9.1          
[13] promises_1.3.3     httr_1.4.7         purrr_1.1.0        lazyeval_0.2.2    
[17] cli_3.6.5          shiny_1.11.1       rlang_1.1.7        covr_3.6.5        
[21] ellipsis_0.3.2     remotes_2.5.0      withr_3.0.2        cachem_1.1.0      
[25] devtools_2.4.5     tools_4.5.0        parallel_4.5.0     memoise_2.0.1     
[29] httpuv_1.6.16      vctrs_0.6.5        R6_2.6.1           mime_0.13         
[33] lifecycle_1.0.5    magick_2.9.0       rsvg_2.7.0         fs_1.6.6          
[37] htmlwidgets_1.6.4  usethis_3.1.0      miniUI_0.1.2       pkgconfig_2.0.3   
[41] desc_1.4.3         callr_3.7.6        rex_1.2.1          pillar_1.11.1     
[45] later_1.4.2        glue_1.8.0         profvis_0.4.0      Rcpp_1.1.1        
[49] tibble_3.3.1       xtable_1.8-4       htmltools_0.5.8.1  functionrunner_1.0