```
library(xavamess)
context("setdiff_symmetric works")
test_that("setdiff_symmetric works assymetrically", {
expect_identical(setdiff_symmetric(1:10, 5:15), c(1:4, 11:15))
expect_identical(setdiff_symmetric(letters[1:10], letters[5:15]), letters[c(1:4, 11:15)])
})
test_that("setdiff_symmetric works when only 1 object has additional elements", {
expect_identical(setdiff_symmetric(1:10, 5:10), 1:4)
expect_identical(setdiff_symmetric(letters[1:10], letters[5:10]), letters[1:4])
expect_identical(setdiff_symmetric(5:10, 5:15), 11:15)
expect_identical(setdiff_symmetric(letters[5:10], letters[5:15]), letters[11:15])
})
test_that("setdiff_symmetric returns an empty set for identical vectors", {
expect_identical(setdiff_symmetric(1:10, 1:10), integer(0))
expect_identical(setdiff_symmetric(letters[1:10], letters[1:10]), character(0))
})
test_that("setdiff_symmetric works with data.frames", {
skip_if_not_installed("dplyr")
# Create a dummy data.frame
df <- data.frame(a = 1:15, b = letters[1:15])
# Compute the set and the expected result
res <- setdiff_symmetric(df[1:10,], df[5:15,])
exp <- df[c(1:4, 11:15),]
# The DFs may come in a different order and with different row names
res <- res[order(res$b),]
rownames(res) <- NULL
exp <- exp[order(exp$b),]
rownames(exp) <- NULL
# Check
expect_identical(res, exp)
# Also check empty difference
expect_identical(nrow(setdiff_symmetric(df[1:10,], df[1:10,])), 0L)
})
```

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