Nothing
test_unique <- function() {
d <- data.frame(x = c(1, 1, 2), y = c(1, 2, 1))
expect_true(!check_cols_form_unique_keys(d, "x"))
expect_true(!check_cols_form_unique_keys(d, "y"))
expect_true(check_cols_form_unique_keys(d, c("x", "y")))
invisible(NULL)
}
test_unique()
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