Nothing
test_that("fill_value works", {
expect_equal(fill_value(c(NA,1), 2), c(2, 1))
expect_equal(fill_value(c(NA, NA, 5), 5), c(5, 5 ,5))
})
test_that("fill_value error", {
expect_error(fill_value(c(NA, 0)))
})
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