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