} catch (JobProcessingException e) {
            assertEquals("Python script is not specified.", e.getMessage());
        }
    }

    // Test executePython with null filename
    public void test_executePython_nullFilename() {
        pythonJob.filename = null;

        try {
            pythonJob.executePython();
            fail("Should throw JobProcessingException");
        } catch (JobProcessingException e) {