}

        public Builder userHome(Path userHome) {
            this.userHome = userHome;
            return this;
        }

        public Builder stdIn(InputStream stdIn) {
            this.stdIn = stdIn;
            return this;
        }

        public Builder stdOut(OutputStream stdOut) {
            this.stdOut = stdOut;
            return this;
        }

        }
    }

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

        try {
            JobProcess jobProcess = processHelper.startProcess(sessionId, cmdList, pbCall);

	// io.CopyN done shortly afterwards to trigger any IO errors.
	var seekSkipped int64 // Number of bytes skipped via Seek
	if sr, ok := r.(io.Seeker); ok && n > 1 {
		// Not all io.Seeker can actually Seek. For example, os.Stdin implements
		// io.Seeker, but calling Seek always returns an error and performs
		// no action. Thus, we try an innocent seek to the current position
		// to see if Seek is really supported.

			ndjson = true
		}

		toPrint := make([]string, 0, 16)
		for _, file := range files {
			var r io.Reader
			var sz int64
			switch file {
			case "-":
				r = os.Stdin
			default:
				f, err := os.Open(file)
				if err != nil {
					return err
				}
				if st, err := f.Stat(); err == nil {
					sz = st.Size()
				}
				defer f.Close()
				r = f
			}