public OrderedProperties addStringPairs(String keyValuePairs) {
        PropertiesReader reader = new PropertiesReader(pairs);
        reader.read(keyValuePairs);
        return this;
    }
@Test
    public void addStringPairs() {
        OrderedProperties pairs = new OrderedProperties()
            .addStringPairs("first=1\nsecond=2\nthird=3\nFOURTH=4");
        assertValueOrder(pairs, "1", "2", "3", "4");
    }