fix(2): mattermost functional tests share a deterministic admin bootstrap (_mm.bootstrap_admin) — only ONE unauthenticated first-user creation is allowed, so the multi-user test no longer collides with create_message

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/mattermost-lts/functional/_mm.py

@@ -0,0 +1,47 @@
+"""Shared mattermost-lts test helpers.
+
+mattermost lets the FIRST user be created unauthenticated (and makes them system admin); after that,
+open signups are disabled (`api.user.create_user.no_open_server`). Several functional tests share one
+per-run deployment (the custom tier), so they cannot each create "the first user." Instead they all
+bootstrap ONE deterministic admin: whichever test runs first creates it (201, as the first user); the
+rest log in as the same admin. Subsequent (non-first) users are created via the admin token, which
+works regardless of the open-signup setting.
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "..", "runner"))
+from harness import http as harness_http  # noqa: E402
+
+ADMIN_EMAIL = "ccci-admin@ccci.example.com"
+ADMIN_USERNAME = "ccciadmin"
+ADMIN_PW = "Ccci-Test-Pw-2026!"
+
+
+def bearer(token: str) -> dict[str, str]:
+    return {"Authorization": f"Bearer {token}"}
+
+
+def bootstrap_admin(base: str) -> str:
+    """Return a system-admin session token for the shared deployment.
+
+    Create the deterministic admin as the first user if the server is fresh (201); otherwise it
+    already exists (400/403) — log in as it. Either way we end with a valid admin token. RAISES if
+    neither create nor login yields a usable session (a genuinely broken auth path)."""
+    # Try to create the first user (unauthenticated; only succeeds on a fresh server).
+    harness_http.http_post(
+        f"{base}/users",
+        data={"email": ADMIN_EMAIL, "username": ADMIN_USERNAME, "password": ADMIN_PW},
+        timeout=30,
+    )
+    # Whether or not creation succeeded (it 4xxs if the admin already exists / signups closed), log in.
+    status, _, hdrs = harness_http.post_with_headers(
+        f"{base}/users/login", data={"login_id": ADMIN_EMAIL, "password": ADMIN_PW}, timeout=30
+    )
+    assert status == 200, f"admin login failed: HTTP {status}"
+    token = hdrs.get("Token") or hdrs.get("token")
+    assert token, f"admin login returned no Token header; headers={list(hdrs.keys())}"
+    return token

tests/mattermost-lts/functional/test_create_message.py

@@ -19,43 +19,20 @@ import os
 import sys
 import uuid
 
+sys.path.insert(0, os.path.dirname(__file__))
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "..", "runner"))
+import _mm  # noqa: E402
 from harness import http as harness_http  # noqa: E402
 
-# Password must satisfy mattermost's default policy (>=5 chars; use a clearly strong one).
-_ADMIN_PW = "Ccci-Test-Pw-2026!"
-
-
-def _bearer(token: str) -> dict[str, str]:
-    return {"Authorization": f"Bearer {token}"}
-
 
 def test_create_message_roundtrip(live_app):
     base = f"https://{live_app}/api/v4"
     uniq = uuid.uuid4().hex[:10]
 
-    # 1) Bootstrap first user (system admin on a fresh server). username: lowercase alnum.
-    username = f"ccci{uniq}"
-    email = f"{username}@ccci.example.com"
-    status, user = harness_http.http_post(
-        f"{base}/users",
-        data={"email": email, "username": username, "password": _ADMIN_PW},
-        timeout=30,
-    )
-    assert status in (200, 201) and isinstance(user, dict) and user.get("id"), (
-        f"first-user creation failed: HTTP {status}, body={user!r}"
-    )
-
-    # 2) Login → token in the `Token` response header.
-    status, _, hdrs = harness_http.post_with_headers(
-        f"{base}/users/login",
-        data={"login_id": email, "password": _ADMIN_PW},
-        timeout=30,
-    )
-    assert status == 200, f"login failed: HTTP {status}"
-    token = hdrs.get("Token") or hdrs.get("token")
-    assert token, f"login returned no Token header; headers={list(hdrs.keys())}"
-    auth = _bearer(token)
+    # 1-2) Bootstrap the shared system admin (first user on a fresh server, else log in as it).
+    # mattermost allows only ONE unauthenticated first-user creation, and several functional tests
+    # share this deployment — so all bootstrap the same deterministic admin (see _mm.bootstrap_admin).
+    auth = _mm.bearer(_mm.bootstrap_admin(base))
 
     # 3) Create a team, then an open channel in it.
     status, team = harness_http.http_post(

tests/mattermost-lts/functional/test_multiuser_message.py

@@ -4,7 +4,7 @@ The defining behaviour of a team-chat platform is that a message one user posts
 readable by *another* user in the same channel — not just round-tripped by its own author (that is
 `test_create_message.py`). This exercises the real membership + post-delivery path end-to-end:
 
-  1. Bootstrap user_a (first user = system admin) → login → create team + open channel.
+  1. Bootstrap the shared system admin (user_a) → create team + open channel.
   2. user_a posts a unique marker message to the channel.
   3. Create a SECOND user (user_b) via the admin API; add user_b to the team + the channel.
   4. user_b logs in (its own session token) and GETs the channel's posts.
@@ -20,19 +20,15 @@ import os
 import sys
 import uuid
 
+sys.path.insert(0, os.path.dirname(__file__))
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "..", "runner"))
+import _mm  # noqa: E402
 from harness import http as harness_http  # noqa: E402
 
-_PW = "Ccci-Test-Pw-2026!"
-
-
-def _bearer(token: str) -> dict[str, str]:
-    return {"Authorization": f"Bearer {token}"}
-
 
 def _login(base: str, login_id: str) -> str:
     status, _, hdrs = harness_http.post_with_headers(
-        f"{base}/users/login", data={"login_id": login_id, "password": _PW}, timeout=30
+        f"{base}/users/login", data={"login_id": login_id, "password": _mm.ADMIN_PW}, timeout=30
     )
     assert status == 200, f"login {login_id} failed: HTTP {status}"
     token = hdrs.get("Token") or hdrs.get("token")
@@ -44,16 +40,8 @@ def test_second_user_reads_first_users_message(live_app):
     base = f"https://{live_app}/api/v4"
     uniq = uuid.uuid4().hex[:10]
 
-    # 1) user_a = first user (system admin), login, team + channel
-    email_a = f"ccci{uniq}@ccci.example.com"
-    status, ua = harness_http.http_post(
-        f"{base}/users",
-        data={"email": email_a, "username": f"ccci{uniq}", "password": _PW},
-        timeout=30,
-    )
-    assert status in (200, 201) and ua.get("id"), f"user_a create HTTP {status}: {ua!r}"
-    auth_a = _bearer(_login(base, email_a))
-
+    # 1) user_a = shared system admin; create team + open channel
+    auth_a = _mm.bearer(_mm.bootstrap_admin(base))
     status, team = harness_http.http_post(
         f"{base}/teams",
         data={"name": f"t{uniq}", "display_name": f"ccci {uniq}", "type": "O"},
@@ -76,11 +64,11 @@ def test_second_user_reads_first_users_message(live_app):
     )
     assert status in (200, 201) and post.get("id"), f"post create HTTP {status}: {post!r}"
 
-    # 3) create user_b (admin API) + add to team + channel
+    # 3) create user_b (admin API — works with open-signup off) + add to team + channel
     email_b = f"ccci{uniq}b@ccci.example.com"
     status, ub = harness_http.http_post(
         f"{base}/users",
-        data={"email": email_b, "username": f"ccci{uniq}b", "password": _PW},
+        data={"email": email_b, "username": f"ccci{uniq}b", "password": _mm.ADMIN_PW},
         headers=auth_a,
         timeout=30,
     )
@@ -101,7 +89,7 @@ def test_second_user_reads_first_users_message(live_app):
     assert status in (200, 201), f"add user_b to channel HTTP {status}"
 
     # 4) user_b logs in (own session) and reads the channel posts
-    auth_b = _bearer(_login(base, email_b))
+    auth_b = _mm.bearer(_login(base, email_b))
     status, posts = harness_http.http_get(
         f"{base}/channels/{chan['id']}/posts", headers=auth_b, timeout=30
     )