QL code and tests for C#/C++/JavaScript.

cpp/ql/src/Best Practices/SwitchLongCase.cpp

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+//This switch statement has long case statements, and can become difficult to
+//read as the processing for each message type becomes more complex
+switch (message_type) {
+	case CONNECT:
+		_state = CONNECTING;
+		int message_id = message_get_id(message);
+		int source = connect_get_source(message);
+		//More code here...
+		send(connect_response);
+		break;
+	case DISCONNECT:
+		_state = DISCONNECTING;
+		int message_id = message_get_id(message);
+		int source = disconnect_get_source(message);
+		//More code here...
+		send(disconnect_response);
+		break;
+	default:
+		log("Invalid message, id : %d", message_get_id(message));
+}
+
+//This is better, as each case is split out to a separate function
+switch (packet_type) {
+	case STREAM:
+		process_stream_packet(packet);
+		break;
+	case DATAGRAM:
+		process_datagram_packet(packet);
+		break;
+	default:
+		log("Invalid packet type: %d", packet_type);
+}