Nothing
test_that("util_only_NAs works", {
expect_equal(util_only_NAs(1), 0)
expect_equal(util_only_NAs(1:10), 0)
expect_equal(util_only_NAs(NA), 1)
expect_equal(util_only_NAs(matrix(nrow = 12, ncol = 17)), 1)
expect_equal(util_only_NAs(matrix(nrow = 12, ncol = 17, data = 17)), 0)
})
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