test_that("use", {
expect_silent(check_fids(fids = "1"))
expect_silent(check_fids("Doe"))
expect_silent(check_fids(c("1", "2")))
expect_error(check_fids(NA))
expect_error(check_fids(NULL))
expect_error(check_fids(Inf))
expect_error(check_fids(""))
expect_error(check_fids(c("1", "")))
expect_error(check_fids(c()))
expect_error(check_fids(3.14))
expect_error(check_fids(42))
})
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