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

    @Test
    public void test_startProcess_invalidCommand() {
        String sessionId = "test_invalid";
        List<String> cmdList = Arrays.asList("nonexistent_command_12345");
        Consumer<ProcessBuilder> pbCall = pb -> {