test_that("can customise what statuses are errors", {
  req <- request_test()
  expect_equal(error_is_error(req, response(404)), TRUE)
  expect_equal(error_is_error(req, response(200)), FALSE)

  req <- req %>% req_error(is_error = ~ !resp_is_error(.x))
  expect_equal(error_is_error(req, response(404)), FALSE)
  expect_equal(error_is_error(req, response(200)), TRUE)
})

test_that("can customise error info", {
  req <- request_test()
  expect_equal(error_body(req, response(404)), NULL)

  req <- req %>% req_error(body = ~"Hi!")
  expect_equal(error_body(req, response(404)), "Hi!")
})

test_that("failing callback still generates useful body", {
  req <- request_test() %>% req_error(body = ~ abort("This is an error!"))
  expect_snapshot_error(error_body(req, response(404)))

  out <- expect_snapshot(error = TRUE, {
    req <- request_test("/status/404")
    req <- req %>% req_error(body = ~ resp_body_json(.x)$error)
    req %>% req_perform()
  })
})