@Test
public void shouldEnsureTimestampHeaderPresentInTimestampedEvent() {

  SimpleEvent base = new SimpleEvent();
  TimestampedEvent timestampedEvent = new TimestampedEvent(base);
  assertEquals(FIXED_TIME_MILLIS, timestampedEvent.getTimestamp());
  assertEquals(String.valueOf(FIXED_TIME_MILLIS),
          timestampedEvent.getHeaders().get("timestamp"));
}