R Under development (unstable) (2023-11-13 r85520 ucrt) -- "Unsuffered Consequences"
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> # the testthat library executes test within the optmatch namespace,
> # so it can't detect if we forget to export methods
> # R CMD check tests, on the other hand, use the package externally
> 
> library(optmatch)
> 
> data(nuclearplants)
> 
> ### as.matrix
> 
> # sparse
> tmp <- match_on(pr ~ date + cost, data = nuclearplants, within = exactMatch(pr ~ pt, data = nuclearplants))
> 
> tmp.m <- as.matrix(tmp)
> 
> stopifnot(dim(tmp.m) == c(10,22))
> stopifnot(class(tmp.m)[1] == "matrix")
> 
> # dense
> tmp <- match_on(pr ~ date + cost, data = nuclearplants)
> 
> tmp.m <- as.matrix(tmp)
> 
> stopifnot(dim(tmp.m) == c(10,22))
> stopifnot(class(tmp.m)[1] == "matrix")
> 
> proc.time()
   user  system elapsed 
   1.21    0.17    1.39