test_that("plotting choice data works", {
  data <- simulate_choices(
    form = choice ~ cost | 0,
    N = 100,
    T = 10,
    J = 2,
    alternatives = c("bus", "car"),
    true_parameter = list("alpha" = -1)
  )
  pdf(NULL)
  out <- plot(data, by_choice = TRUE)
  dev.off()
  expect_true(inherits(out, "gtable"))
})

test_that("plotting mixture contour works", {
  means <- list(c(0, 0), c(2, 2))
  covs <- list(diag(2), 0.5 * diag(2))
  weights <- c(0.7, 0.3)
  names <- c("A", "B")
  plot <- plot_mixture_contour(means, covs, weights, names)
  expect_true(ggplot2::is_ggplot(plot))
})

test_that("ROC curve can be created", {
  data <- prepare_data(
    form = choice ~ price | 0,
    choice_data = train_choice, id = "deciderID", idc = "occasionID"
  )
  model_train_1 <- fit_model(
    data = data,
    scale = "price := -1"
  )
  model_train_2 <- update(
    model_train_1, form = form <- choice ~ price + time + change + comfort | 0
  )
  expect_true(ggplot2::is_ggplot(plot_roc(model_train_1)))
  expect_true(ggplot2::is_ggplot(plot_roc(model_train_1, model_train_2)))
})