Nothing
test_that("returns TRUE for a column with unique values", {
data_frame <- data.frame(id = c(1, 2, 3, 4, 5))
expect_true(is_unique_column("id", data_frame))
})
test_that("returns FALSE for a column with duplicate values", {
data_frame <- data.frame(id = c(1, 2, 3, 4, 5, 1))
expect_false(is_unique_column("id", data_frame))
})
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