Nothing
test_that("count_missing", {
expect_equal(count_missing(1), 0)
expect_equal(count_missing(integer()), 0)
expect_equal(count_missing(NA), 1)
expect_equal(count_missing(c(1, NA)), 1)
expect_equal(count_missing(NA), 1)
expect_equal(count_missing(NA_integer_), 1)
expect_equal(count_missing(NA_real_), 1)
expect_equal(count_missing(NA_complex_), 1)
expect_equal(count_missing(NA_character_), 1)
})
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