System.setProperty("test.property", "test.value");
        execJob.testAddSystemProperty(cmdList, "test.property", "default", null);
        assertEquals(1, cmdList.size());
        assertEquals("-Dtest.property=test.value", cmdList.get(0));

        // Test with append value
        cmdList.clear();
        execJob.testAddSystemProperty(cmdList, "test.property", "default", ":append");
        assertEquals(1, cmdList.size());