Test 4 fails on solution-stretch code

[joe-dev-public]

If this line:

auth-challenge/test/helpers.js

Line 1 in e3521b6

const DIR = "solution";

is replaced with:

const DIR = "solution-stretch";

and we then npm run test:4, the test will fail.

Some of the test output reproduced here in case it saves a bit of time:

TypeError: Cannot read properties of undefined (reading 'id')
    at post (/Users/Joe/FAC/mentoring/prep/03_Authentication/challenge/auth-challenge/solution-stretch/routes/log-out.js:4:29)
...
# Subtest: POST /log-out deletes session and clears cookie
not ok 1 - POST /log-out deletes session and clears cookie
  ---
  duration_ms: 0.307583083
  failureType: 'testCodeFailure'
  error: 'Expected log in to redirect, but got status: 500'
  code: 'ERR_ASSERTION'
  stack: |-
    TestContext.<anonymous> (/Users/Joe/FAC/mentoring/prep/03_Authentication/challenge/auth-challenge/test/4.test.js:22:10)
    process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    async Test.run (node:internal/test_runner/test:418:9)
  ...
1..1
# tests 1
# pass 0
# fail 1
...