test_that("`Poisson limits are right", {
  lims <-
    calculate_limits(
      data.frame(number_seq = c(15, 20, 30))
      , target = 1
      , draw_adjusted = FALSE
    )

  expect_length(lims, 5)
  expect_length(lims[, 1], 3)
  expect_equal(round(lims$ll95, 7), c(0.5596924, 0.6108260, 0.6746958))
  expect_equal(round(lims$ul95, 6), c(1.649348, 1.544419, 1.427562))
  expect_equal(round(lims$ll99, 7), c(0.3862650, 0.4479107, 0.5289724))
  expect_equal(round(lims$ul99, 6), c(2.082907, 1.902094, 1.702771))

  expect_s3_class(funnel_grey(), "theme")
})