nim-eth/tests/rlp/test_json_suite.nim

import
  os, strutils, strformat,
  util/json_testing

template sourceDir: string = currentSourcePath.rsplit(DirSep, 1)[0]

const casesDir = &"{sourceDir}{DirSep}cases{DirSep}"

for file in walkDirRec(casesDir):
  if file.endsWith("json"):
    runTests(file)