Nothing
test_that("idx to letter", {
expect_true(is.character(idx_to_letter(3)))
expect_equal(idx_to_letter(3), "c")
})
test_that("letter to idx", {
expect_true(is.numeric(letter_to_idx('c')))
expect_equal(letter_to_idx('c'), 3)
})
test_that("letters to idx", {
expect_true(is.numeric(letters_to_idx(c('a', 'b', 'c', 'a'))))
expect_true(is.vector(letters_to_idx(c('a', 'b', 'c', 'a'))))
expect_equal(length(letters_to_idx(c('a', 'b', 'c', 'a'))), 4)
expect_equal(letters_to_idx(c('a', 'b', 'c', 'a'))[3], 3)
})
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