Field keyValueStringField = AbstractPE.class.getDeclaredField("keyValueString");
keyValueStringField.setAccessible(true);
keyValueStringField.set(refPE, "value");
refPE.setId("statefulPE");
refPE.setKeys(new String[] {});
KryoSerDeser kryoSerDeser = new KryoSerDeser();
byte[] refBytes = kryoSerDeser.serialize(refPE);
Assert.assertTrue(Arrays.equals(refBytes,
TestUtils.readFileAsByteArray(expected)));
app.destroy();