props.put(PROP_ASTRING, testString);
props.put(PROP_DATA_PROC, new DummyProcessor());
TestConfigurable tc = ConfigurationManager.getInstance(TestConfigurable.class, props);
// now create a property sheet in order to modify the configurable
PropertySheet propSheet = new PropertySheet(tc, null, new RawPropertyData("tt", tc.getClass().getName()), new ConfigurationManager());
propSheet.setComponent(PROP_DATA_PROC, "tt", new AnotherDummyProcessor());
tc.newProperties(propSheet);
// test whether old props were preserved and new ones were applied