Nothing
test_that(".NeverDrop() works", {
expect_error(.NeverDrop(FALSE, letters))
expect_equal(character(0), expect_warning(.NeverDrop("NOT THERE", letters)))
expect_equal(character(0), .NeverDrop(labels = letters))
expect_equal(character(0), .NeverDrop(NULL, labels = letters))
expect_equal(character(0), .NeverDrop(logical(0), labels = letters))
expect_equal(letters[2:3], sort(.NeverDrop(c("b", "c"), labels = letters)))
expect_equal(letters[2:3], sort(.NeverDrop(3:2, labels = letters)))
expect_equal(letters[26], expect_warning(.NeverDrop(26:27, labels = letters)))
})
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