test_that("visualize: general tests", {
  set.seed(123)
  data <- draw_data_roc(
    n = 400,
    prev = c(0.25, 0.75),
    m = 4,
    auc = c(0.9, 0.95),
    e = 10,
    modnames = LETTERS[1:4]
  )

  expect_s3_class(visualize(evaluate(data)), "ggplot")
})