import { join as joinPath, dirname } from 'path' import { fileURLToPath } from 'url' import { deepStrictEqual } from 'assert' import * as fs from 'fs' const { readFile, writeFile } = fs.promises global.window = global global.fetch = (url) => { // this is a fake implementation of fetch for the tester // -> refer to https://devdocs.io/javascript/global_objects/fetch const accessBody = async () => { throw Error('body unavailable') } return { ok: false, type: 'basic', status: 500, statusText: 'Internal Server Error', json: accessBody, text: accessBody, } } const wait = delay => new Promise(s => setTimeout(s, delay)) const fail = fn => { try { fn() } catch (err) { return true } } const eq = (a, b) => (deepStrictEqual(a, b), true) const name = process.argv[2] const fatal = (...args) => { console.error(...args) process.exit(1) } if (!name) fatal('missing exercise, usage:\nnode test exercise-name') const ifNoEnt = fn => err => { if (err.code !== 'ENOENT') throw err fn(err) } const root = dirname(fileURLToPath(import.meta.url)) const read = (filename, description) => readFile(filename, 'utf8').catch( ifNoEnt(() => fatal(`Missing ${description} for ${name}`)), ) const { join } = [] const { split } = '' const stackFmt = (err, url) => { String.prototype.split = split Array.prototype.join = join return err.stack.split(url).join(`${name}.js`) } const main = async () => { const [test, code] = await Promise.all([ read(joinPath(root, `${name}_test.js`), 'test'), read(`/jail/student/${name}.js`, 'student solution'), ]) if (code.includes('import')) fatal('import keyword not allowed') const parts = test.split('// /*/ // ⚡') const [inject, testCode] = parts.length < 2 ? ['', test] : parts const combined = `${inject.trim()}\n${code .replace(inject.trim(), '') .trim()}\n${testCode.trim()}\n` const b64 = Buffer.from(combined).toString('base64') const url = `data:text/javascript;base64,${b64}` const { setup, tests } = await import(url).catch(err => fatal(`Unable to execute ${name} solution, error:\n${stackFmt(err, url)}`), ) const ctx = (await (setup && setup())) || {} const tools = { eq, fail, wait, code, ctx } for (const [i, t] of tests.entries()) { try { if (!await t(tools)) { throw Error('Test failed') } } catch (err) { console.log(`test #${i} failed:\n${t.toString()}\n\nError:`) fatal(stackFmt(err, url)) } } console.log(`${name} passed (${tests.length} tests)`) } main().catch(err => fatal(err.stack))