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 { join } = [] const { split } = '' const eq = (a, b) => { const noSplit = !''.split const noJoin = ![].join String.prototype.split = split Array.prototype.join = join deepStrictEqual(a, b) noSplit && (String.prototype.split = undefined) noJoin && (Array.prototype.join = undefined) return true } const [submitPath, name] = process.argv.slice(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 readTest = filename => readFile(filename, 'utf8').then(test => ({ test, mode: filename.endsWith('.js') ? 'function' : 'node', })) const stackFmt = (err, url) => { if (!(err instanceof Error)) { throw Error(`Unexpected type thrown: ${typeof err}. usage: throw Error('my message')`) } String.prototype.split = split Array.prototype.join = join return err.stack.split(url).join(`${name}.js`) } const any = arr => new Promise(async (s, f) => { let firstError const setError = err => firstError || (firstError = err) await Promise.all(arr.map(p => p.then(s, setError))) f(firstError) }) const testNode = async ({ test, name }) => { const path = `${submitPath}/${name}.mjs` return { path, url: joinPath(root, `${name}_test.mjs`), code: await read(path, 'student solution'), } } const runTests = async ({ url, path, code }) => { 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, path } for (const [i, t] of tests.entries()) { try { if (!(await t(tools))) { throw Error('Test failed') } } catch (err) { console.log(`test #${i+1} failed:\n${t.toString()}\n\nError:`) fatal(stackFmt(err, url)) } } console.log(`${name} passed (${tests.length} tests)`) } const main = async () => { const { test, mode } = await any([ readTest(joinPath(root, `${name}_test.js`)), readTest(joinPath(root, `${name}_test.mjs`)), ]).catch(ifNoEnt(() => fatal(`Missing test for ${name}`))) if (mode === "node") return runTests(await testNode({ test, name })) const path = `${submitPath}/${name}.js` const rawCode = await read(path, "student solution") // this is a very crude and basic removal of comments // since checking code is only use to prevent cheating // it's not that important if it doesn't work 100% of the time. const code = rawCode.replace(/\/\*[\s\S]*?\*\/|\/\/.*/g, "").trim() if (code.includes("import")) fatal("import keyword not allowed") const parts = test.split("// /*/ // ⚡") const [inject, testCode] = parts.length < 2 ? ["", test] : parts const combined = `${inject.trim()}\n${rawCode .replace(inject.trim(), "") .trim()}\n${testCode.trim()}\n` const b64 = Buffer.from(combined).toString("base64") const url = `data:text/javascript;base64,${b64}` return runTests({ path, code, url }) } main().catch(err => fatal(err.stack))