R Under development (unstable) (2023-07-19 r84711 ucrt) -- "Unsuffered Consequences"
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> 
> expect_equal <- function(x, y) {
+   stopifnot(isTRUE(all.equal(x, y)))
+ }
> 
> library(reclin2)
Loading required package: data.table

Attaching package: 'reclin2'

The following object is masked from 'package:base':

    identical

> 
> x <- data.table(a = c(1,1,2,2), b = c(1,2,1,2))
> y <- data.table(a = c(3,3,2,2), b = c(1,2,1,2))
> 
> pairs <- pair(x, y)
> expect_equal(names(pairs), c(".x", ".y"))
> expect_equal(pairs$.x, rep(1:4, each = 4))
> expect_equal(pairs$.y, rep(1:4, times = 4))
> expect_equal(attr(pairs, "x"), x)
> expect_equal(attr(pairs, "y"), y)
> 
> pairs <- pair(x, y, add_xy = FALSE)
> expect_equal(attr(pairs, "x"), NULL)
> expect_equal(attr(pairs, "y"), NULL)
> 
> 
> pairs <- pair(x, deduplication = TRUE)
> expect_equal(names(pairs), c(".x", ".y"))
> expect_equal(pairs$.x, c(1,1,1,2,2,3))
> expect_equal(pairs$.y, c(2,3,4,3,4,4))
> 
> 
> proc.time()
   user  system elapsed 
   0.31    0.07    0.37