Nothing
test_that("missing values handled", {
expect_true( is.na(d_pal(NA))) %>% expect_message()
expect_equal(d_pal(c(NA, 1)), c(NA, "#4B0055"))
expect_equal(d_pal(c(NA, 1, 10)), c(NA, "#4B0055", "#FDE333"))
})
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