Akka.Streams.Tests.IO.FileSourceSpec.FileSource_should_count_lines_in_a_real_file C# (CSharp) Method

        public void FileSource_should_count_lines_in_a_real_file(int chunkSize, int readAhead)
        {
            var s = FileIO.FromFile(ManyLines(), chunkSize)
                .WithAttributes(Attributes.CreateInputBuffer(readAhead, readAhead));
            var f = s.RunWith(
                Sink.Aggregate<ByteString, int>(0, (acc, l) => acc + l.DecodeString(Encoding.UTF8).Count(c => c == '\n')),
                _materializer);

            f.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
            var lineCount = f.Result;
            lineCount.Should().Be(LinesCount);
        }