@Test public void randomLong_epochSecondsPlusRandom() {

  mockStatic(System.class);
  when(System.currentTimeMillis())
    .thenReturn(1465510280_000L); // Thursday, June 9, 2016 10:11:20 PM
  long traceIdHigh = platform.nextTraceIdHigh();
  assertThat(HexCodec.toLowerHex(traceIdHigh)).startsWith("5759e988");
}