silent({
  reg = makeTestRegistry()
  fun = function(i) { fun = function(i) i^2; parallelMap::parallelMap(fun, 1:i)}
  ids = batchMap(fun, i = 1:4, reg = reg)
})

test_that("pm/multicore", {
  skip_on_os("windows")
  skip_if_not_installed("parallelMap")
  skip_on_ci()
  if (reg$cluster.functions$name %chin% c("Parallel", "Socket"))
    skip("Nested local parallelization not supported")

  submitAndWait(reg, ids = ids, resources = list(pm.backend = "multicore", ncpus = 2))
  expect_equal(nrow(findDone(reg = reg)), 4L)
})

test_that("pm/socket", {
  skip_if_not_installed("parallelMap")
  skip_if_not_installed("snow")
  skip_on_ci()
  if (reg$cluster.functions$name %chin% c("Parallel", "Socket"))
    skip("Nested local parallelization not supported")

  submitAndWait(reg, ids = ids, resources = list(pm.backend = "socket", ncpus = 2))
  expect_equal(nrow(findDone(reg = reg)), 4L)
})

test_that("parallelMap works with batchtools", {
  skip_if_not_installed("parallelMap")
  skip_if_not(packageVersion("parallelMap") >= "1.4")
  requireNamespace("parallelMap")

  dir = reg$temp.dir %??% fs::path_temp()
  parallelMap::parallelStartBatchtools(storagedir = dir, show.info = FALSE)
  dir = getOption("parallelMap.bt.reg.filedir")
  res = parallelMap::parallelMap(function(x, y) x + y, x = 1:2, y = 1)
  parallelMap::parallelStop()
  if (fs::dir_exists(dir))
    fs::dir_delete(dir)
  expect_equal(res, list(2, 3))
})

# test_that("pm/mpi", {
#   skip_on_os("mac")
#   skip_on_cran()
#   skip_if_not_installed("parallelMap")
#   skip_if_not_installed("snow")
#   skip_if_not_installed("Rmpi")
#   skip_on_ci()
#   if (reg$cluster.functions$name %chin% c("Parallel", "Socket"))
#     skip("Nested local parallelization not supported")

#   submitAndWait(reg, ids = ids, resources = list(pm.backend = "mpi", ncpus = 2))
#   expect_equal(nrow(findDone(reg = reg)), 4)
# })