test_that("inconsistent scope intput raises an error", {
  # inexistant scope
  expect_error(scope_normalize("animal"), "must be one of ")
  expect_error(scope_normalize(I("animal")), "must be one of ")
  expect_error(scope_normalize(I(c("animal", "spaces"))), "must be one of ")

  # other than one with character
  expect_error(scope_normalize(c("none", "tokens")), "either of class `AsIs` or length")
})

test_that("consistent input yields right output", {
  levels <- c("none", "spaces", "indention", "line_breaks", "tokens")
  expect_equal(
    scope_normalize(I("tokens")),
    factor("tokens", levels = levels, ordered = TRUE)
  )
  expect_equal(
    scope_normalize(I("none")),
    factor("none", levels = levels, ordered = TRUE)
  )

  expect_equal(
    scope_normalize(I("indention")),
    factor("indention", levels = levels, ordered = TRUE)
  )

  expect_equal(
    scope_normalize(I(c("indention", "tokens"))),
    factor(c("indention", "tokens"), levels = levels, ordered = TRUE)
  )

  expect_equal(
    scope_normalize("spaces"),
    factor(c("none", "spaces"), levels = levels, ordered = TRUE)
  )

  expect_equal(
    scope_normalize("indention"),
    factor(c("none", "spaces", "indention"), levels = levels, ordered = TRUE)
  )

  expect_equal(
    scope_normalize("line_breaks"),
    factor(c("none", "spaces", "indention", "line_breaks"), levels = levels, ordered = TRUE)
  )
  expect_equal(
    scope_normalize("tokens"),
    factor(levels, levels = levels, ordered = TRUE)
  )
})