test_that("use", {
expect_silent(check_crown_age(3.14))
expect_silent(check_crown_age(42))
expect_error(check_crown_age(-12.34))
expect_error(check_crown_age(""))
expect_error(check_crown_age("nonsense"))
expect_error(check_crown_age(NA))
expect_error(check_crown_age(NULL))
expect_error(check_crown_age(c(1, 2)))
})
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