public void test_filename() {
        assertNull(pythonJob.filename);

        PythonJob result = pythonJob.filename("test.py");

        assertSame(pythonJob, result);
        assertEquals("test.py", pythonJob.filename);
    }

    // Test single argument addition
    public void test_arg() {
        assertTrue(pythonJob.argList.isEmpty());

        PythonJob result = pythonJob.arg("arg1");