@Test
public void testEventTimestamp() throws JsonSyntaxException,  IOException {

  JsonParser parser = new JsonParser();
  JsonElement input = parser.parse(getResourceString("prefixed_input.json"));
  DummpyEvent devent = new DummpyEvent();
  devent.payload = input.getAsJsonObject();
  GelfOperation op = new GelfOperation(new ArrayList<>());
  InternalEvent ievent = new InternalEvent("", null, 1234567890123L);
  ievent.setEventObj(devent);
  ievent.setEventTime(1522686301055L);
  op.perform(ievent);
  assertTrue(devent.payload.toString().contains("\"timestamp\":1.522686301055E9"));
}