diff --git a/js/tests/tell-me-who_test.mjs b/js/tests/tell-me-who_test.mjs
new file mode 100644
index 00000000..3a31168e
--- /dev/null
+++ b/js/tests/tell-me-who_test.mjs
@@ -0,0 +1,179 @@
+import * as cp from 'child_process'
+import fs from 'fs/promises'
+import { join, resolve, isAbsolute } from 'path'
+import { tmpdir } from 'os'
+import { promisify } from 'util'
+const mkdir = fs.mkdir
+const rmdir = fs.rmdir
+const writeFile = fs.writeFile
+
+const exec = promisify(cp.exec)
+
+export const tests = []
+const name = 'tell-me-who'
+// maybe get the sames from an api? like https://parser.name/
+const guests = [
+  'Shyam Langley',
+  'Austin Harwood',
+  'Reem Morgan',
+  'Neal Chamberlain',
+  'Ryan Walters',
+  'Ocean Battle',
+  'Ubaid Ballard',
+  'Victoria Chan',
+  'Dominika Mullen',
+  'Heath Denton',
+  'Lilith Hamilton',
+  'Aisling Bailey',
+  'Maizie Love',
+  'Nathanial Franco',
+  'Charmaine Bernard',
+  'Sohail Downes',
+  'Rabia Gomez',
+  'Brendan Brennan',
+  'Shannen Atherton',
+  'Esa Villarreal',
+  'Kayla Wynn',
+  'Gladys Hardy',
+  'Laaibah Rogers',
+  'Zishan Randolph',
+  'Connor Connolly',
+  'Arabella Wooten',
+  'Edna Floyd',
+  'Roksana Montoya',
+  'Macauley Ireland',
+  'Kennedy Cummings',
+  'Emelia Calhoun',
+  'Jimmy Hickman',
+  'Leela Solomon',
+  'Frederick David',
+  'Eryk Winters',
+  'Olli Obrien',
+  'Jagoda Avalos',
+  'Bethanie Emery',
+  'Kenya Medina',
+  'Ava-Mai Estes',
+  'Robyn Jimenez',
+  'Carly Alexander',
+  'Jed Newman',
+  'Marianna Sullivan',
+  'Alicja Scott',
+  'Isaac Guerrero',
+  'Dion Huff',
+  'Milly Quintero',
+  'Kwabena Cairns',
+  'Rukhsar Conley',
+  'Glyn Townsend',
+  'Colby Holmes',
+  'Zeynep East',
+  'Miriam Higgins',
+  'Kaelan Clegg',
+  'Sharna English',
+  'Uma Ortega',
+  'Crystal Bird',
+  'Christopher Haas',
+  'Olivier Galvan',
+  'Esha Herring',
+  'Montana Mooney',
+  'Amelia-Rose Trejo',
+  'Micah Whittle',
+  'Nola Sherman',
+  'Gregory Vu',
+  'Lili Griffiths',
+  'Tasnia Hughes',
+  'Trixie Pennington',
+  'Ava Meyer',
+  'Konrad Weaver',
+  'Gabriela Tucker',
+  'Kiri Wilcox',
+]
+const shuffle = arr => {
+  let i = arr.length
+  let j, tmp
+  while (--i > 0) {
+    j = Math.floor(Math.random() * (i + 1))
+    tmp = arr[j]
+    arr[j] = arr[i]
+    arr[i] = tmp
+  }
+  return arr
+}
+const getRandomList = (names) =>
+  shuffle(names).slice(0, Math.floor(Math.random() * (names.length - 10) + 10))
+const getExpected = (list) =>
+  list
+    .map((g) =>
+      g
+        .split(' ')
+        .reverse()
+        .join(' '),
+    )
+    .sort()
+    .map((g, i) => `${i +1}. ${g}`)
+    .join('\n')
+
+export const setup = async () => {
+  const dir = tmpdir()
+
+  // check if already exists and rm?
+  await mkdir(`${dir}/${name}`)
+  const randomList = getRandomList(guests)
+  const expected = getExpected(randomList)
+  console.log({randomList, expected})
+  await Promise.all(
+    randomList.map(
+      async (n) =>
+        await writeFile(
+          `${dir}/${name}/${n.replace(' ', '_')}.json`,
+          '',
+          'utf8',
+        ),
+    ),
+  )
+
+  return { tmpPath: dir, expected }
+}
+const printGuestList = async ({ arg, ctx, path, eq }) => {
+  const scriptPath = join(resolve(), path)
+  const { stdout } = await exec(`node ${scriptPath} ${arg}`, {
+    cwd: arg ? `${ctx.tmpPath}` : `${ctx.tmpPath}/${name}`,
+  })
+  console.log({stdout})
+
+  // await rmdir(`${ctx.tmpPath}/${name}`, { recursive: true })
+  return eq(stdout.trim(), ctx.expected)
+}
+
+tests.push(async ({ path, eq, ctx }) => {
+  // will execute the script with "tell-me-who" as an argument
+  // `tell-me-who` folder has random files names
+  return printGuestList({
+    path,
+    eq,
+    ctx,
+    arg: 'tell-me-who',
+  })
+})
+
+tests.push(async ({ path, eq, ctx }) => {
+  // will execute the script without argument
+  // in the `tell-me-who` folder
+  return printGuestList({
+    path,
+    eq,
+    ctx,
+    arg: '',
+  })
+})
+
+tests.push(async ({ path, eq, ctx }) => {
+  // will execute the script with `tell-me-who` folder's absolute path as argument
+  return printGuestList({
+    path,
+    eq,
+    ctx,
+    arg: `${ctx.tmpPath}/tell-me-who`,
+  })
+})
+
+Object.freeze(tests)
diff --git a/subjects/tell-me-who/README.md b/subjects/tell-me-who/README.md
new file mode 100644
index 00000000..01c8d07a
--- /dev/null
+++ b/subjects/tell-me-who/README.md
@@ -0,0 +1,16 @@
+## tell-me-who
+
+### Instructions
+
+Create a `tell-me-how-who.mjs` script that takes your folder path as an argument and print the names of the guests that answered to your invitation in the console.
+The output must print one guest per line, in ascending alphabetic order, and formated as following: `Number. Lastname Firstname` (number beginning at 1).
+
+### Notions
+- [Node file system: `readdir`](https://nodejs.org/api/fs.html#fs_fspromises_readdir_path_options)
+- [`Array.prototype.map()` method](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)
+- [`String.prototype.split()` method](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split)
+- [`Array.prototype.join()` method](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/join)
+- [`String.prototype.slice()` method](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice)
+- [`String.prototype.concat()` method](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat)
+- [`Array.prototype.sort()` method](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort)
+