test(node): allocate daemon test ports instead of hardcoding 28000

test_daemon.py started the real admin UI on a fixed port, so every test file
that also brought up a node collided with it. Each file passed on its own and
the full node suite failed with EADDRINUSE on test_daemon_creates_chat_store —
which reads as a flaky regression rather than a test-isolation bug.

Confirmed against a clean worktree at HEAD before touching anything: the
failure predates the invite work.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/packages/meshbay-node/tests/test_daemon.py b/packages/meshbay-node/tests/test_daemon.py
index 0698104..60ef11f 100644
--- a/packages/meshbay-node/tests/test_daemon.py
+++ b/packages/meshbay-node/tests/test_daemon.py
@@ -34,6 +34,20 @@ def _mock_keystore_keys(sk_ed):
     mock_keys.pk_x25519_b64 = base64.b64encode(pk_x_raw).decode()
     return mock_keys
 
+def _free_port() -> int:
+    """
+    A port nobody else in the session is on.
+
+    These tests start the real admin UI server. Hardcoding 28000 made them fail
+    with EADDRINUSE whenever another test file had a node running — which is why
+    the full suite failed while each file passed on its own.
+    """
+    import socket
+    with socket.socket() as s:
+        s.bind(("127.0.0.1", 0))
+        return s.getsockname()[1]
+
+
 @pytest.fixture
 def sk_hub():
     return Ed25519PrivateKey.generate()
@@ -59,7 +73,7 @@ def shared_dir(tmp_path):
 def node_config(tmp_path, shared_dir):
     return Config(
         hub=HubConfig(url="http://localhost:9999", username="testuser"),
-        node=NodeConfig(quic_port=29010, ui_port=28000),
+        node=NodeConfig(quic_port=_free_port(), ui_port=_free_port()),
         groups=[GroupConfig(
             id="g" * 32,
             name="test-group",
@@ -190,7 +204,7 @@ async def test_daemon_index_change_pushes_to_peers(tmp_path, shared_dir, gek, hu
     """Index change callback pushes updated index to WebRTC peers."""
     config = Config(
         hub=HubConfig(url="http://localhost:9999", username="testuser"),
-        node=NodeConfig(quic_port=29010, ui_port=28000),
+        node=NodeConfig(quic_port=_free_port(), ui_port=_free_port()),
         groups=[GroupConfig(
             id="a" * 32,
             name="test-group",
@@ -241,7 +255,7 @@ async def test_daemon_index_change_registers_swarm_for_public_group(
     """Public groups still register content hashes with the hub swarm (H7)."""
     config = Config(
         hub=HubConfig(url="http://localhost:9999", username="testuser"),
-        node=NodeConfig(quic_port=29010, ui_port=28000),
+        node=NodeConfig(quic_port=_free_port(), ui_port=_free_port()),
         groups=[GroupConfig(
             id="a" * 32,
             name="public-group",