test_that("check_edition() validates inputs", {
expect_error(check_edition(20), "not available")
expect_error(check_edition("x"), "single number")
expect_equal(check_edition(1.5), 1)
if (packageVersion("testthat") >= "2.99") {
expect_equal(check_edition(), 3)
} else {
expect_equal(check_edition(), 2)
}
})
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