assertFalse(processHelper.isProcessRunning());
        } catch (Exception e) {
            fail("Unexpected exception: " + e.getMessage());
        }
    }

    public void test_sendCommand_withRunningProcess() {
        String sessionId = "test_send_command";
        List<String> cmdList = Arrays.asList("cat"); // cat reads from stdin
        Consumer<ProcessBuilder> pbCall = pb -> {