tests/testthat/test-utils.R

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test_that("case-insensitive sort order", {
  expect_equal(sort_ci(rev(letters)), letters)
  expect_equal(sort_ci(rev(LETTERS)), LETTERS)
  expect_equal(
    sort_ci(c(letters[1:3], LETTERS[1:3])),
    c("A", "a", "B", "b", "C", "c")
  )
})