assertTrue(result.contains("Session Id: custom-session-456"));
        assertEquals("custom-session-456", thumbnailJob.sessionId);
    }

    // Test execute with process failure
    public void test_execute_processFailure() {
        thumbnailJob.numOfThreads(1);

        testProcessHelper.exitValue = 1;
        testProcessHelper.processOutput = "Error: Thumbnail generation failed";

        assertTrue(result.contains("Session Id: custom-session-123"));
        assertEquals("custom-session-123", pythonJob.sessionId);
    }

    // Test execute with process failure
    public void test_execute_processFailure() {
        pythonJob.filename("failing.py");

        testProcessHelper.exitValue = 1;
        testProcessHelper.processOutput = "Error: Script failed";

        String result = pythonJob.execute();