test_that("use", {
expect_true(are_all_unique(1))
expect_true(are_all_unique(c(1, 2)))
expect_false(are_all_unique(c(1, 1)))
expect_error(are_all_unique(c()))
expect_error(are_all_unique(NULL))
expect_error(are_all_unique(NA))
})
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