import { readFileSync } from 'node:fs'
import { fileURLToPath } from 'node:url'
import { dirname, join } from 'node:path'

const here = dirname(fileURLToPath(import.meta.url))

/** Load fixtures/<name>.json as { function, cases: [{ name, args, expected }] }. */
export const loadFixture = (name) =>
  JSON.parse(readFileSync(join(here, '..', '..', 'fixtures', `${name}.json`), 'utf8'))

/** Deep-freeze for tests (independent of the student's deepFreeze). */
export const freeze = (x) => {
  if (x !== null && typeof x === 'object' && !Object.isFrozen(x)) {
    Object.freeze(x)
    Object.values(x).forEach(freeze)
  }
  return x
}