add client dispatcher unit tests

tests/test_client.py

@@ -0,0 +1,41 @@
+"""Tests for MumbleClient dispatcher and callback wiring."""
+
+from tuimble.client import MumbleClient
+
+
+def test_default_state():
+    client = MumbleClient(host="localhost")
+    assert client.connected is False
+    assert client.users == {}
+    assert client.channels == {}
+    assert client.my_channel_id is None
+
+
+def test_dispatcher_routes_callback():
+    client = MumbleClient(host="localhost")
+    calls = []
+    client.set_dispatcher(lambda fn, *a: calls.append((fn, a)))
+
+    sentinel = object()
+    client.on_connected = sentinel
+    client._dispatch(client.on_connected)
+    assert len(calls) == 1
+    assert calls[0] == (sentinel, ())
+
+
+def test_dispatch_without_dispatcher_calls_directly():
+    client = MumbleClient(host="localhost")
+    results = []
+
+    def callback():
+        results.append("called")
+
+    client.on_connected = callback
+    client._dispatch(client.on_connected)
+    assert results == ["called"]
+
+
+def test_dispatch_skips_none_callback():
+    client = MumbleClient(host="localhost")
+    # Should not raise
+    client._dispatch(None)