skip_on_os(c("mac", "solaris"))
test_that("values_at / pretty_range", {
  x <- 1:1000
  expect_identical(pretty_range(n = 5)(x), pretty_range(x, n = 5))
  expect_identical(values_at(values = "meansd")(x), values_at(x, values = "meansd"))
  expect_identical(values_at(values = "minmax")(x), values_at(x, values = "minmax"))
})

test_that("values_at", {
  x <- 1:1000
  mu <- mean(x)
  stddev <- sd(x)
  expect_equal(
    round(c(mu - stddev, mu, mu + stddev), 1),
    round(values_at(x), 1),
    tolerance = 1e-3
  )
})