public void Test_Flush_FlushesHeader()
{
using (var outputStream = new MemoryStream())
using (var key = XChaChaKey.Generate())
using (var encryptionStream = new XChaChaStream(outputStream, key, EncryptionMode.Encrypt))
{
var plaintext = Array.Empty <byte>();
encryptionStream.WriteFinal(plaintext);
encryptionStream.Flush();
var ciphertext = outputStream.ToArray();
Assert.Equal(StreamHeaderLength, ciphertext.Length);
}
}