fit <- stats::lm(Sepal.Length ~ ., data = iris)
x <- flashlight(model = fit, label = "lm", data = iris, y = "Sepal.Length")

test_that("basic functionality works", {
  surr <- light_global_surrogate(x)
  expect_equal(surr$data$r_squared, 0.923, tolerance = 0.001)
  expect_true(inherits(plot(surr), "list"))
})

test_that("by variable work", {
  surr <- light_global_surrogate(x, by = "Species", v = c("Species", "Petal.Length"))
  expect_equal(dim(surr$data), c(3L, 4L))
})

test_that("argument 'v' works", {
  surr <- light_global_surrogate(x, v = "Petal.Length")
  expect_equal(dim(surr$data), c(1L, 3L))
})

test_that("multiflashlights work", {
  fit1 <- stats::lm(Sepal.Length ~ Species, data = iris)
  fl1 <- flashlight(model = fit1, label = "Species", data = iris, y = "Sepal.Length")
  fit2 <- stats::lm(Sepal.Length ~ Petal.Length, data = iris)
  fl2 <- flashlight(
    model = fit2, label = "Petal.Length", data = iris, y = "Sepal.Length"
  )
  fls <- multiflashlight(list(fl1, fl2))
  surr <- light_global_surrogate(fls)
  expect_equal(dim(surr$data), c(2L, 3L))
  expect_equal(surr$data$r_squared, c(1, 0.978), tolerance = 0.001)
})