@Test
    @Ignore
    public void testRetainOldValuesOnConfigUpdates() {
        AppConfig config = new AppConfig(new AppConfig.Builder());
        //config.setConfig(List.of("message \"one\"", "times 333"), "", 0L);
        assertEquals("one", config.message());
        assertEquals(333, config.times());

        //config.setConfig(List.of("message \"two\""), "", 0L);
        assertEquals("two", config.message());
        assertEquals("config.times retains previously set value", 333, config.times());

        //config.setConfig(List.of("times 666"), "", 0L);
        assertEquals("config.message retains previously set value", "two", config.message());
        assertEquals(666, config.times());
    }
Verifies that values set in previous setConfig() calls are
retained when the payload in a new setConfig() call does not
overwrite them.
config/src/test/java/com/yahoo/config/subscription/ConfigInstanceTest.java