Revision should be the one of the last event when folding at end of stream

Author: thinkbeforecoding

src/EventStore.Client.Streams/EventStoreClient.Read.cs

@@ -149,25 +149,27 @@ public async ValueTask<FoldResult<T>> FoldStreamAsync<T,E>(
 						Stream = ReadReq.Types.Options.Types.StreamOptions.FromStreamNameAndRevision(streamName, revision),
 						Count = long.MaxValue
 					}
-					
 				};
 			if (readReq.Options.Filter == null) {
 				readReq.Options.NoFilter = new Empty();
 			}
 
 			readReq.Options.UuidOption = new ReadReq.Types.Options.Types.UUIDOption { Structured = new Empty() };
 
-			var call = 
+			var call =
 					_client.Read(readReq,
 						EventStoreCallOptions.Create(Settings, operationOptions, userCredentials, cancellationToken))
 					.ResponseStream.ReadAllAsync().GetAsyncEnumerator();
 
+
 			var hasNext = await call.MoveNextAsync(cancellationToken).ConfigureAwait(false);
 
 			var rev =
 				hasNext && call.Current.ContentCase == ReadResp.ContentOneofCase.StreamNotFound
 					? StreamRevision.None
-					: StreamRevision.FromStreamPosition(revision);
+					: hasNext
+						? StreamRevision.FromStreamPosition(revision)
+						: StreamRevision.FromStreamPosition(revision-1);
 
 			while(hasNext) {
 				if (call.Current.ContentCase == ReadResp.ContentOneofCase.Event) {

test/EventStore.Client.Streams.Tests/fold_stream.cs

@@ -126,7 +126,7 @@ await _fixture.Client.AppendToStreamAsync(streamName, StreamState.NoStream,
 				new List<StreamPosition>());
 
 
-			var expected = StreamRevision.FromInt64(pos);
+			var expected = StreamRevision.FromInt64(pos-1);
 			Assert.Equal(expected, result.Revision);
 		}