piscine-js lite - node quest - exo 2: verydisco-forever

js/tests/verydisco-forever_test.mjs

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+import fs from 'fs/promises'
+const readFile = fs.readFile
+import { promisify } from 'util'
+import * as cp from 'child_process'
+
+const exec = promisify(cp.exec)
+
+export const tests = []
+const name = 'verydisco-forever'
+const withArgAndExpect = async ({ arg, expect, path, eq }) => {
+  const cwd = `${path
+    .split('/')
+    .slice(0, -1)
+    .join('/')}/`
+  await exec(`node ${name}.mjs "${arg}"`, { cwd })
+  const out = await readFile(`${cwd}${name}.txt`, 'utf8').catch((err) =>
+    err.code === 'ENOENT' ? 'output file not found' : err,
+  )
+  await exec(`rm ${name}.txt`, { cwd })
+  return eq(out, expect)
+}
+
+tests.push(async ({ path, eq }) =>
+  withArgAndExpect({ path, eq, arg: 'discovery', expect: 'verydisco' }),
+)
+
+tests.push(async ({ path, eq }) =>
+  withArgAndExpect({ path, eq, arg: 'kiss cool', expect: 'sski olco' }),
+)
+
+tests.push(async ({ path, eq }) =>
+  withArgAndExpect({
+    path,
+    eq,
+    arg: 'Node is awesome',
+    expect: 'deNo si omeawes',
+  }),
+)
+
+Object.freeze(tests)

subjects/verydisco-forever/README.md

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+## verydisco-forever
+
+### Instructions
+
+Create a `verydisco-forever.mjs` script that does exactly the same as you verydisco script, but write the result in a `verydisco-forever.txt` file instead of printing it in the console.
+
+### Notions
+
+- [Node file system: `writeFile`](https://nodejs.org/api/fs.html#fs_fspromises_writefile_file_data_options)
+- [Node path: `resolve`](https://nodejs.org/api/path.html#path_path_resolve_paths)
+- [Node path: `join`](https://nodejs.org/api/path.html#path_path_join_paths)
+
+