DEPRECATION: multiprocess -> multisession

[HenrikBengtsson]

In your package test, you use the 'multiprocess' backend:

FAMoS/tests/testthat/test.example.R

Line 4 in 7457483

plan(multiprocess, workers = availableCores() - 1)

which was deprecated in future 1.20.0 (2020-10-30), in favor of explicitly specifying either 'multisession' or 'multicore', cf. futureverse/future#420.

I recommend that you replace that line with just:

plan(multisession)

Note also, when using workers = availableCores() - 1, there you'll get workers == 0 on a machine that runs the test on a single core. I don't think CRAN ever does that, but if they'd do, your package would produce an error. Because of this, I recommend to use the default, which equals workers = availableCores(), which in turn becomes workers = 2 whenever R CMD check is running (to meet the CRAN policies).