client: add ConnectionFailed and reconnect method

tests/test_client.py

@@ -1,8 +1,8 @@
 """Tests for MumbleClient dispatcher and callback wiring."""
 
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch
 
-from tuimble.client import MumbleClient
+from tuimble.client import ConnectionFailed, MumbleClient
 
 
 def test_default_state():
@@ -83,3 +83,40 @@ def test_cert_custom():
     )
     assert client._certfile == "/path/cert.pem"
     assert client._keyfile == "/path/key.pem"
+
+
+def test_connection_failed_retryable():
+    exc = ConnectionFailed("network error", retryable=True)
+    assert str(exc) == "network error"
+    assert exc.retryable is True
+
+
+def test_connection_failed_not_retryable():
+    exc = ConnectionFailed("auth rejected", retryable=False)
+    assert str(exc) == "auth rejected"
+    assert exc.retryable is False
+
+
+def test_connection_failed_default_retryable():
+    exc = ConnectionFailed("something broke")
+    assert exc.retryable is True
+
+
+def test_reconnect_resets_state():
+    client = MumbleClient(host="localhost")
+    client._connected = True
+    client._mumble = MagicMock()
+
+    with patch.object(client, "connect"):
+        client.reconnect()
+
+    # disconnect should have cleared _mumble before connect
+    assert client._connected is False
+
+
+def test_disconnect_clears_connected():
+    client = MumbleClient(host="localhost")
+    client._connected = True
+    client._mumble = MagicMock()
+    client.disconnect()
+    assert client.connected is False