protected override async Task When()
 {
     _response = await AppendToStreamBatch(new BatchAppendReq {
         Options = new() {
             Any = new(),
             StreamIdentifier = new() { StreamName = ByteString.CopyFromUtf8("stream") }
         },
         IsFinal          = true,
         ProposedMessages = { CreateEvents(1) },
 protected override async Task When()
 {
     _response = await AppendToStreamBatch(new BatchAppendReq {
         Options = new BatchAppendReq.Types.Options {
             Any = new Empty(),
             StreamIdentifier = new StreamIdentifier {
                 StreamName = ByteString.CopyFromUtf8("stream")
             }
         },
         IsFinal          = true,
         ProposedMessages = { CreateEvents(1) },
         CorrelationId    = Uuid.NewUuid().ToDto()
     });
 }