test(hub): join from an invitation link and land under the group's handle

The invitation probe listed no groups, so after Join the address stayed the
#/group/<id> the button navigated to and the group links' rewrite to
#/name@owner was never exercised on that path. A third case has the hub list
the group once joined, as it does: the group page opens, the address shows
the handle without a history entry of its own, and the code still never
reaches the hub.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 35 insertions, 5 deletions

diff --git a/packages/meshbay-hub/tests/harness/invite_link_probe.py b/packages/meshbay-hub/tests/harness/invite_link_probe.py
index 97ee893..b0a833e 100644
--- a/packages/meshbay-hub/tests/harness/invite_link_probe.py
+++ b/packages/meshbay-hub/tests/harness/invite_link_probe.py
@@ -13,6 +13,9 @@ Loads the shipped `app.js` in a real browser with `fetch` stubbed, twice:
 
   signed_out — a link, no session
   signed_in  — the same link, a session; then the Join button is clicked
+  signed_in_listed — the same, with the hub listing the group once joined, as
+               it does: the group page opens and the address shows its handle
+               (`#/name@owner`, group-link.js)
 
     invite_link_probe.py
 
@@ -56,7 +59,15 @@ window.fetch = async (url, init = {}) => {
   calls.push({ url: u, body: init.body ? String(init.body) : '' });
   if (u.includes('/v1/users/me/preferences')) return json({});
   if (u.includes('/v1/users/me')) return json({ user_id: 'u-1', role: 'user' });
-  if (u.includes('/v1/groups/mine')) return json({ groups: [] });
+  // Joined, the hub lists the group — in the one case that says so. The others
+  // keep an empty list, so the address stays the `#/group/<id>` the Join
+  // button navigated to and is read before the router could rewrite it.
+  if (u.includes('/v1/groups/mine')) return json({ groups:
+    CASE === 'signed_in_listed' && calls.some((c) => c.url.includes('/redeem'))
+      ? [{ id: '__GROUP__', name: 'Some Group', owner_username: 'the-owner',
+           visibility: 'private', created_at: '2026-01-01T00:00:00+00:00',
+           description: '' }]
+      : [] });
   if (u.includes('/v1/invite-links/preview')) return json({
     group_id: '__GROUP__', group_name: 'Some Group', inviter: 'the-owner',
     expires_at: '2099-01-01T00:00:00+00:00', already_member: false });
@@ -65,7 +76,7 @@ window.fetch = async (url, init = {}) => {
   if (u.includes('/nodes')) return json({ nodes: [] });
   return json({});
 };
-if (CASE === 'signed_in') {
+if (CASE.startsWith('signed_in')) {
   localStorage.setItem('mb_auth', JSON.stringify({
     username: 'invitee-account', userId: 'u-1', token: 'tok', refreshToken: 'ref',
     role: 'user' }));
@@ -98,6 +109,12 @@ const text = () => document.getElementById('app').innerText;
       out.join_button = Boolean(join);
       if (join) { join.click(); await wait(1500); }
       out.hash_after_click = location.hash;
+      if (CASE === 'signed_in_listed') {
+        await wait(1500);
+        out.hash_settled = decodeURI(location.hash);
+        out.group_page = Boolean(document.querySelector('.group-header'));
+        out.history_length = history.length;
+      }
       out.redeem_bodies = calls.filter((c) => c.url.includes('/redeem')).map((c) => c.body);
     }
     out.code_in_a_hub_request = calls.some(
@@ -169,7 +186,7 @@ def _run(case: str) -> dict | None:
 def main() -> int:
     with socketserver.TCPServer(("127.0.0.1", PORT), H) as srv:
         threading.Thread(target=srv.serve_forever, daemon=True).start()
-        results = [_run("signed_out"), _run("signed_in")]
+        results = [_run("signed_out"), _run("signed_in"), _run("signed_in_listed")]
     if not all(results):
         print(json.dumps({"error": "no measurement", "got": results}), file=sys.stderr)
         return 1
diff --git a/packages/meshbay-hub/tests/test_invite_link_flow.py b/packages/meshbay-hub/tests/test_invite_link_flow.py
index 42f461c..cc8b432 100644
--- a/packages/meshbay-hub/tests/test_invite_link_flow.py
+++ b/packages/meshbay-hub/tests/test_invite_link_flow.py
@@ -33,14 +33,14 @@ def cases():
     return out
 
 
-@pytest.mark.parametrize("case", ["signed_out", "signed_in"])
+@pytest.mark.parametrize("case", ["signed_out", "signed_in", "signed_in_listed"])
 def test_the_code_is_out_of_the_address_and_kept_in_the_tab(cases, case):
     c = cases[case]
     assert c["hash_after_load"] == "#/invite"
     assert c["pending"] and c["pending"]["c"] == "K7P2-9WQX"
 
 
-@pytest.mark.parametrize("case", ["signed_out", "signed_in"])
+@pytest.mark.parametrize("case", ["signed_out", "signed_in", "signed_in_listed"])
 def test_the_code_never_reaches_the_hub(cases, case):
     assert cases[case]["code_in_a_hub_request"] is False
 
@@ -59,3 +59,16 @@ def test_a_signed_in_reader_joins_with_one_click_and_lands_on_the_group(cases):
     assert c["join_button"]
     assert c["redeem_bodies"] == ['{"ticket":"AbCdEfGhIjKlMnOpQr-_12"}']
     assert c["hash_after_click"] == "#/group/0f8fad5b-d9cb-469f-a165-70867728950e"
+
+
+def test_once_listed_the_joined_group_opens_under_its_handle(cases):
+    """The group links (group-link.js) rewrite `#/group/<id>` to the handle as
+    soon as the hub lists the group. Joining from an invitation must land on
+    the group page all the same, under that handle, with the rewrite adding
+    no history entry of its own — and still without the code reaching the hub."""
+    c = cases["signed_in_listed"]
+    assert c["join_button"]
+    assert c["hash_settled"] == "#/Some Group@the-owner"
+    assert c["group_page"] is True
+    # The page load, then the Join button's navigation; the rewrite replaces.
+    assert c["history_length"] == 2