feat(friend-support): add draft test

- currently working only with `guests` provided directory
in public/js/tests dir -> test must be able to get `guests` dir
from student repo
- need to check if there are more cases to test

js/tests/friend-support_test.mjs

@@ -0,0 +1,88 @@
+import { once } from 'node:events'
+import * as cp from 'node:child_process'
+import fs from 'node:fs/promises'
+
+export const tests = []
+const fetch = _fetch // to redefine the real fetch
+
+const port = 5000
+
+// tell-me-who_test setup -- see how to have same files in testing directories
+// TO BE IMPLEMENTED
+
+const sendRequest = async (path, options) => {
+  const response = await fetch(`http://localhost:${port}${path}`, options)
+  const { status, statusText, ok } = response
+  const headers = Object.fromEntries(response.headers)
+  let body = ''
+  try {
+    body = await response.json()
+  } catch (err) {
+    body = err
+  }
+  return { status, body, headers }
+}
+
+tests.push(async ({ path, ctx }) => {
+  ctx.server = cp.spawn('node', [`${path}`])
+  const message = await Promise.race([
+    once(ctx.server.stdout, 'data'),
+    Promise.race([
+      once(ctx.server.stderr, 'data').then(String).then(Error),
+      once(ctx.server, 'error'),
+    ]).then(x => Promise.reject(x)),
+  ])
+  return message[0].toString().includes(port)
+})
+
+tests.push(async ({ eq }) => {
+  const { status, body, headers } = await sendRequest('/Zoe_Sierra', {
+    method: 'GET',
+  })
+  let cont = await fs.readFile('./guests/Zoe_Sierra.json', {
+    encoding: 'utf-8',
+  })
+  return eq(
+    {
+      status: status,
+      body: body,
+      contentType: headers['content-type'],
+    },
+    {
+      status: 200,
+      body: JSON.parse(cont),
+      contentType: 'application/json',
+    },
+  )
+})
+
+tests.push(async ({ eq }) => {
+	const { status, body, headers } = await sendRequest('/Zoe_Sierra1', {
+	  method: 'GET',
+	})
+	console.log(body.error)
+	return eq(
+	  {
+		status: status,
+		body: body.error.trim(),
+		contentType: headers['content-type'],
+	  },
+	  {
+		status: 404,
+		body: "guest not found",
+		contentType: 'application/json',
+	  },
+	)
+  })
+
+// this test must always run to shutdown server
+/* currently breaking if one test fails - it might not be a problem
+since the tests are run in a separate Docker image...
+*/
+tests.push(({ ctx }) => {
+  const { server } = ctx
+  server.kill('SIGQUIT')
+  return true
+})
+
+Object.freeze(tests)