### Question:
TraceProtoUtils { public static ByteString toProtoTraceId(String traceId) { return ByteString.copyFrom(TraceId.bytesFromHex(traceId, 0)); } private  TraceProtoUtils(); static ByteString toProtoSpanId(String spanId); static ByteString toProtoTraceId(String traceId); static TraceConfig traceConfigFromProto(
      io.opentelemetry.proto.trace.v1.TraceConfig traceConfigProto);  }### Answer:
@Test void toProtoTraceId() { ByteString expected = ByteString.copyFrom(TRACE_ID_BYTES); assertThat(TraceProtoUtils.toProtoTraceId(TraceId.bytesToHex(TRACE_ID_BYTES))) .isEqualTo(expected); }