skip_if_not_installed("MASS")

test_that("model.matrix.rlm accepts `data` argument", {
  mod <- MASS::rlm(mpg ~ hp + factor(cyl), mtcars)
  mm <- get_modelmatrix(mod)
  expect_true(is.matrix(mm))
  expect_equal(dim(mm), c(32, 4))
  mm <- get_modelmatrix(mod, data = head(mtcars))
  expect_true(is.matrix(mm))
  expect_equal(dim(mm), c(6, 4))
})

test_that("predict.rlm", {
  mod <- MASS::rlm(mpg ~ hp + factor(cyl), mtcars)
  a <- get_predicted(mod)
  b <- get_predicted(mod, predict = NULL, type = "response", verbose = FALSE)
  expect_s3_class(a, "get_predicted")
  expect_s3_class(b, "get_predicted")
  expect_equal(a, b, ignore_attr = TRUE)
  expect_equal(as.vector(a), as.vector(b))
  expect_error(get_predicted(mod, predict = "link"))
  expect_error(get_predicted(mod, predict = NULL, type = "link"))
})