test_that("use", {
expect_silent(check_epoch(42))
expect_silent(check_epoch(1))
expect_silent(check_epoch(0))
expect_error(check_epoch(c(1, 1)))
expect_error(check_epoch(-1))
expect_error(check_epoch("nonsense"))
expect_error(check_epoch(""))
expect_error(check_epoch(c()))
expect_error(check_epoch(NA))
expect_error(check_epoch(NULL))
expect_error(check_epoch(Inf))
expect_error(check_epoch(3.14))
})
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