---
phase: 08-stack-upgrade-backend-decomposition
plan: 01
type: execute
wave: 0
depends_on: []
files_modified:
  - backend/tests/test_auth.py
autonomous: true
requirements: [CR-01, CR-02, CR-03]
tags: [tests, session-revocation, wave-0]
must_haves:
  truths:
    - "Three new pytest tests exist for CR-01, CR-02, CR-03 as xfail stubs"
    - "Stubs name the exact behavior they cover so executor of plan 08-03 can promote them"
    - "Running pytest -v shows three new tests with status xfail (not error, not pass)"
  artifacts:
    - path: "backend/tests/test_auth.py"
      provides: "Three new xfail test stubs for session revocation on privilege change"
      contains: "test_change_password_revokes_other_sessions"
  key_links:
    - from: "backend/tests/test_auth.py"
      to: "backend/api/auth.py change_password / enable_totp / disable_totp"
      via: "test exercises real handler via httpx.AsyncClient"
      pattern: "client.post\\(\"/api/auth/(change-password|totp/enable|totp)\""
---

<objective>
Create Wave 0 test stubs (xfail) for CR-01, CR-02, CR-03. These tests will be promoted to passing in plan 08-03 after the `useToastStore` stub and frontend wiring are complete. The backend implementation for all three is ALREADY in place (verified in RESEARCH.md §"Wave 1: Session Revocation"); these stubs lock the expected behavior contract before any refactoring touches `api/auth.py`.

Purpose: Anti-regression Nyquist scaffold — when plan 08-06 splits `api/auth.py` into `api/auth/` package, these promoted tests guarantee the session revocation logic still works through the new module structure.

Output: Three xfail-marked tests added to `backend/tests/test_auth.py`.
</objective>

<execution_context>
@$HOME/.claude/get-shit-done/workflows/execute-plan.md
@$HOME/.claude/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/PROJECT.md
@.planning/ROADMAP.md
@.planning/STATE.md
@.planning/phases/08-stack-upgrade-backend-decomposition/08-CONTEXT.md
@.planning/phases/08-stack-upgrade-backend-decomposition/08-RESEARCH.md
@.planning/phases/08-stack-upgrade-backend-decomposition/08-VALIDATION.md
@backend/api/auth.py
@backend/services/auth.py
@backend/tests/test_auth.py
@backend/tests/conftest.py
</context>

<tasks>

<task type="auto" tdd="true">
  <name>Task 1: Add three xfail stubs for CR-01/CR-02/CR-03 to test_auth.py</name>
  <files>backend/tests/test_auth.py</files>
  <read_first>
    - backend/tests/test_auth.py (read the full file to discover existing fixtures, login helper pattern, and how authenticated requests are issued)
    - backend/tests/conftest.py (locate `auth_user` fixture, `client` fixture, and `auth_limiter` reset hook)
    - backend/api/auth.py lines 478-540 (change_password — confirm response shape includes `sessions_revoked`)
    - backend/api/auth.py lines 579-636 (enable_totp — confirm response shape)
    - backend/api/auth.py lines 641-682 (disable_totp — confirm response shape)
    - backend/services/auth.py lines 250-273 (revoke_all_refresh_tokens signature with skip_token_hash)
  </read_first>
  <behavior>
    - Test `test_change_password_revokes_other_sessions`: register user, log in twice to obtain TWO refresh-token rows in DB (call them session A and session B). Using session A's access token, POST `/api/auth/change-password` with the correct current password and a new valid password. Assert: response 200, body contains `"sessions_revoked": 1` (session B revoked, session A preserved via `skip_token_hash`); session A's refresh token is still usable on POST `/api/auth/refresh`; session B's refresh token fails on POST `/api/auth/refresh` with 401.
    - Test `test_enable_totp_revokes_other_sessions`: register user, log in twice (sessions A and B). Using session A, POST `/api/auth/totp/setup` to obtain a `provisioning_uri`, derive a valid TOTP code via `pyotp.TOTP(secret).now()`, POST `/api/auth/totp/enable` with that code. Assert: response 200, body contains `"sessions_revoked": 1`, session B refresh fails 401, session A refresh succeeds.
    - Test `test_disable_totp_revokes_other_sessions`: register user, enable TOTP, then log in twice with TOTP (sessions A and B). Using session A, DELETE `/api/auth/totp` with the current TOTP code. Assert: response 200, body contains `"sessions_revoked": 1`, session B refresh fails 401, session A refresh succeeds.
  </behavior>
  <action>
Append three test functions to `backend/tests/test_auth.py`, each decorated with `@pytest.mark.xfail(reason="Wave 0 stub — promoted to passing in 08-03", strict=False)`. Use the existing test patterns in the file (httpx.AsyncClient async fixtures, `auth_user` fixture from conftest, `await client.post(...)`). The three function names MUST be exactly:
  - `async def test_change_password_revokes_other_sessions(client, db_session)`
  - `async def test_enable_totp_revokes_other_sessions(client, db_session)`
  - `async def test_disable_totp_revokes_other_sessions(client, db_session)`
Inside each test body, write the full assertion logic per the `<behavior>` block — do NOT leave them as bare `pass` stubs. The tests SHOULD pass right now (backend already implemented per RESEARCH.md), but `strict=False` xfail allows either xpassed or xfailed without erroring the suite. Plan 08-03 will remove the `@pytest.mark.xfail` decorator and confirm they pass cleanly. Use `pyotp.TOTP(secret).now()` for TOTP code generation; import pyotp at the top of the test file if not already imported. For the login-twice pattern, use distinct `User-Agent` headers on each login to ensure separate refresh-token rows; capture `response.cookies['refresh_token']` for each session.
  </action>
  <verify>
    <automated>cd backend && pytest tests/test_auth.py::test_change_password_revokes_other_sessions tests/test_auth.py::test_enable_totp_revokes_other_sessions tests/test_auth.py::test_disable_totp_revokes_other_sessions --tb=no -q</automated>
  </verify>
  <acceptance_criteria>
    - `grep -c "def test_change_password_revokes_other_sessions" backend/tests/test_auth.py` returns 1
    - `grep -c "def test_enable_totp_revokes_other_sessions" backend/tests/test_auth.py` returns 1
    - `grep -c "def test_disable_totp_revokes_other_sessions" backend/tests/test_auth.py` returns 1
    - `grep -c "pytest.mark.xfail" backend/tests/test_auth.py` increased by at least 3 vs. pre-change baseline
    - Pytest output for these three test IDs shows status `XPASS` or `XFAIL` — never `ERROR` and never `FAILED`
    - Body of each test asserts `data["sessions_revoked"] == 1` (not `>= 1`, not `is not None`)
    - Body of each test verifies the OTHER session's refresh token returns 401 on `/api/auth/refresh`
    - Body of each test verifies the CURRENT session's refresh token returns 200 on `/api/auth/refresh`
  </acceptance_criteria>
  <done>Three xfail-marked tests appended to test_auth.py with full assertion logic exercising the documented CR-01/02/03 contracts; pytest collects and runs them without error.</done>
</task>

</tasks>

<threat_model>
## Trust Boundaries

| Boundary | Description |
|----------|-------------|
| client → POST /api/auth/change-password | Authenticated user requests password change; backend must revoke all OTHER refresh tokens |
| client → POST /api/auth/totp/enable | Authenticated user enables TOTP; backend must revoke all OTHER refresh tokens |
| client → DELETE /api/auth/totp | Authenticated user disables TOTP; backend must revoke all OTHER refresh tokens |

## STRIDE Threat Register

| Threat ID | Category | Component | Disposition | Mitigation Plan |
|-----------|----------|-----------|-------------|-----------------|
| T-08-01-01 | Tampering | Test fixture isolation | mitigate | Each test creates its own user via `auth_user` fixture; tests do not share session state |
| T-08-01-02 | Repudiation | xfail strict mode | mitigate | `strict=False` permits XPASS without erroring; plan 08-03 removes the marker and runs strict |
| T-08-01-SC | Supply Chain | pytest, pyotp | accept | Already pinned in requirements.txt; this plan adds no new packages |
</threat_model>

<verification>
- `cd backend && pytest tests/test_auth.py --tb=no -q` shows three new tests with xpassed/xfailed status (no errors)
- Full backend suite still green: `cd backend && pytest -v` — zero new failures vs. baseline
- File diff shows only additions to `backend/tests/test_auth.py` (no other files touched)
</verification>

<success_criteria>
- Three new xfail tests exist with the exact names listed
- Each test body contains real assertion logic (not `pass` or `pytest.skip`)
- Pytest collects all three without error
</success_criteria>

<output>
Create `.planning/phases/08-stack-upgrade-backend-decomposition/08-01-SUMMARY.md` when done. Include: which fixtures were used, any helper functions added, the exact xfail decorator reason string, and the pre-/post-stub `pytest --co` count.
</output>
