[MacPorts] #68139: R: at least some ports fail to install test files

[MacPorts]

#68139: R: at least some ports fail to install test files
--------------------------+--------------------------
 Reporter:  barracuda156  |      Owner:  barracuda156
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  R
--------------------------+--------------------------
 Not sure why, but at least some R packages fail to install test files; in
 result, while tests can be run via `port test`, they fail to run from
 within R session with:
 {{{
 Error in `test_dir()`:
 ! No test files found
 Run `rlang::last_trace()` to see where the error occurred.
 }}}
 Example:
 https://github.com/rstudio/leaflet/issues/881#issuecomment-1710640584

 I have only access to Rosetta at the moment, so this has to be verified on
 more standard systems.

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Ticket URL: <https://trac.macports.org/ticket/68139>
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