public void Given_a_sequence_validation_transcoder_When_writen_to_the_transcoding_stream_Then_the_inner_stream_contains_the_previous_identifier_followed_by_the_data_written()
{
byte[] hashBytes = { 1, 2, 3, 4 };
const string TestText = "Test";
var hash = new Hash(hashBytes);
var previousEventHashReader = new PreviousEventHashReader(hash);
var sequenceValidationTranscodingStreamFactory = new SequenceValidationTranscodingStreamFactory(previousEventHashReader);
using (var innerStream = new MemoryStream())
using (var sequenceValidationTranscodingStream = sequenceValidationTranscodingStreamFactory.CreateTrancodingStream(innerStream))
{
var writer = new StreamWriter(sequenceValidationTranscodingStream);
writer.Write(TestText);
writer.Flush();
sequenceValidationTranscodingStream.Flush();
innerStream.Seek(0, SeekOrigin.Begin);
var hashBuffer = new byte[4];
innerStream.Read(hashBuffer, 0, 4);
var reader = new StreamReader(innerStream);
var actualText = reader.ReadToEnd();
CollectionAssert.AreEqual(hashBytes, hashBuffer);
Assert.AreEqual(TestText, actualText);
}
}
private static ITranscodingStreamFactory ConstructTranscodingStreamFactories()
{
var hashAlgorithm = SHA256.Create();
var streamHashGenerator = new CryptoStreamHashGenerator(hashAlgorithm);
var hashByteCount = streamHashGenerator.GetHashSize();
var previousEventStreamProvider = new DirectoryPreviousEventStreamProvider(
EventStorePath, EventFilenameGenerator.DefaultFileExtension);
var previousEventHashReader = new PreviousEventStreamHashReader(
previousEventStreamProvider, hashByteCount);
var sequenceValidationTranscodingStreamFactor =
new SequenceValidationTranscodingStreamFactory(previousEventHashReader);
var hashChecksumTranscodingStreamFactory =
new HashChecksumTranscodingStreamFactory(streamHashGenerator, sequenceValidationTranscodingStreamFactor);
return hashChecksumTranscodingStreamFactory;
}
