    @Test
    public void testProperty() {

        Assert.assertEquals("1", PropertyUtil.getProperty("${test:1}"));
        Assert.assertEquals("", PropertyUtil.getProperty("${test}"));

        System.setProperty("test", "2");
        Assert.assertEquals("2", PropertyUtil.getProperty("${test}"));
        Assert.assertEquals("2", PropertyUtil.getProperty("${test:1}"));
    }