R Under development (unstable) (2023-10-04 r85267 ucrt) -- "Unsuffered Consequences"
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> library(matrixTests)
> source("utils/capture.r")
> 
> #--- x has less than 1 observation ---------------------------------------------
> 
> wrn <- 'row_wilcoxon_twosample: 1 of the rows had less than 1 "x" observation.\nFirst occurrence at row 1'
> nacolumns <- c("statistic", "pvalue")
> 
> # 0 observations
> res <- capture(row_wilcoxon_twosample(numeric(), 1))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.x, 0))
> stopifnot(all.equal(res$value$obs.tot, 1))
> 
> # only NA observations
> res <- capture(row_wilcoxon_twosample(c(NA_integer_, NA_integer_), 1))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.x, 0))
> stopifnot(all.equal(res$value$obs.tot, 1))
> 
> 
> #--- y has less than 1 observations --------------------------------------------
> 
> wrn <- 'row_wilcoxon_twosample: 1 of the rows had less than 1 "y" observation.\nFirst occurrence at row 1'
> nacolumns <- c("statistic", "pvalue")
> 
> # 0 observations
> res <- capture(row_wilcoxon_twosample(1, numeric()))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.y, 0))
> stopifnot(all.equal(res$value$obs.tot, 1))
> 
> # only NA observations
> res <- capture(row_wilcoxon_twosample(1, c(NA_integer_, NA_integer_)))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.y, 0))
> stopifnot(all.equal(res$value$obs.tot, 1))
> 
> 
> #--- both x and y have less than 1 observation ---------------------------------
> 
> wrnx <- 'row_wilcoxon_twosample: 1 of the rows had less than 1 "x" observation.\nFirst occurrence at row 1'
> wrny <- 'row_wilcoxon_twosample: 1 of the rows had less than 1 "y" observation.\nFirst occurrence at row 1'
> nacolumns <- c("statistic", "pvalue")
> 
> # 0 observations
> res <- capture(row_wilcoxon_twosample(numeric(), numeric()))
> stopifnot(all.equal(res$warning[1:2], c(wrnx, wrny)))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.x, 0))
> stopifnot(all.equal(res$value$obs.y, 0))
> stopifnot(all.equal(res$value$obs.tot, 0))
> 
> # only NA observations
> res <- capture(row_wilcoxon_twosample(c(NA_integer_, NA_integer_), c(NA_integer_, NA_integer_)))
> stopifnot(all.equal(res$warning[1:2], c(wrnx, wrny)))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.x, 0))
> stopifnot(all.equal(res$value$obs.y, 0))
> stopifnot(all.equal(res$value$obs.tot, 0))
> 
> 
> #--- ties are present ----------------------------------------------------------
> 
> wrn <- 'row_wilcoxon_twosample: 1 of the rows had ties: cannot compute exact p-values with ties.\nFirst occurrence at row 1'
> 
> # warning when exact=TRUE
> res <- capture(row_wilcoxon_twosample(c(3,3,1,2), c(2,0,5,-2), exact=TRUE))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$exact, FALSE))
> stopifnot(all.equal(res$value$obs.x, 4))
> stopifnot(all.equal(res$value$obs.y, 4))
> stopifnot(all.equal(res$value$obs.tot, 8))
> 
> # no warning when exact=FALSE
> res <- capture(row_wilcoxon_twosample(c(3,3,1,2), c(2,0,5,-2), exact=FALSE))
> stopifnot(all.equal(res$warning, NULL))
> stopifnot(all.equal(res$value$exact, FALSE))
> stopifnot(all.equal(res$value$obs.x, 4))
> stopifnot(all.equal(res$value$obs.y, 4))
> stopifnot(all.equal(res$value$obs.tot, 8))
> 
> # ties only after subtracting null
> res <- capture(row_wilcoxon_twosample(c(3.1,4,1,2), c(-1,-2,3,-4), null=0.1, exact=TRUE))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$exact, FALSE))
> stopifnot(all.equal(res$value$obs.x, 4))
> stopifnot(all.equal(res$value$obs.y, 4))
> stopifnot(all.equal(res$value$obs.tot, 8))
> 
> 
> proc.time()
   user  system elapsed 
   0.14    0.07    0.20