R version 4.5.0 beta (2025-03-29 r88074 ucrt) -- "How About a Twenty-Six"
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Platform: x86_64-w64-mingw32/x64

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> library(future.tests)
> library(future)
> 
> test_plans <- test_plans()
> print(test_plans)
list()
> 
> add_test_plan(plan(sequential))
> add_test_plan(plan(multisession, workers = 1L))
> add_test_plan(plan(multisession, workers = 2L))
> 
> test_plans <- test_plans()
> print(test_plans)
[[1]]
plan(sequential)

[[2]]
plan(multisession, workers = 1L)

[[3]]
plan(multisession, workers = 2L)

> stopifnot(length(test_plans) == 3L)
> 
> res <- along_test_plans({ 42L })
Evaluating expression under future plan #1 of 3 ...
sequential:
- args: function (..., envir = parent.frame(), workers = "<NULL>")
- tweaked: FALSE
- call: plan(sequential)
Evaluating expression under future plan #1 of 3 ... DONE
Evaluating expression under future plan #2 of 3 ...
multisession:
- args: function (..., workers = 1L, envir = parent.frame())
- tweaked: TRUE
- call: plan(multisession, workers = 1L)
Evaluating expression under future plan #2 of 3 ... DONE
Evaluating expression under future plan #3 of 3 ...
multisession:
- args: function (..., workers = 2L, envir = parent.frame())
- tweaked: TRUE
- call: plan(multisession, workers = 2L)
Evaluating expression under future plan #3 of 3 ... DONE
> print(res)
[[1]]
[1] 42

[[2]]
[1] 42

[[3]]
[1] 42

> 
> proc.time()
   user  system elapsed 
   1.87    0.12    2.84