test_that("can compute checksum", {
  root <- create_temporary_root(use_file_store = TRUE)
  ids <- vcapply(1:3, function(i) create_random_packet(root))
  hash <- outpack_checksum(root = root)
  expect_equal(hash_parse(hash)$algorithm, "sha256")
  expect_equal(hash, hash_data(paste(ids, collapse = ""), "sha256"))
})

test_that("can compute checksum on empty root", {
  root <- create_temporary_root(use_file_store = TRUE)
  hash <- outpack_checksum("md5", root = root)
  expect_equal(hash, "md5:d41d8cd98f00b204e9800998ecf8427e")
})