assertEquals(0, transport.getInflightRequests());
        assertEquals(0, transport.getNumSessions());
    }

    @Test
    @DisplayName("isDisconnected / isFailed reflect socket and state")
    void connectionStateChecks() throws Exception {
        // Arrange: simulate connected state and open socket
        setField(transport, "state", 3); // connected
        Socket s = mock(Socket.class);