/// <summary>
/// Composes validator ensuring that buffer has valid hash
/// </summary>
/// <param name="hash">The hash.</param>
/// <returns>new instance of the rule validato</returns>
/// <seealso cref="BufferUtil.CalculateSimpleHashCode"/>
public static Rule <byte[]> WithValidHash(int hash)
{
return((bytes, scope) =>
{
var result = BufferUtil.CalculateSimpleHashCode(bytes);
if (result != hash)
{
scope.Error("Byte array should have valid hash.");
}
});
}
public void Check_hash_roundtrips()
{
var buffer = new byte[Rand.Next(2, 64)];
var prov = new RNGCryptoServiceProvider();
prov.GetBytes(buffer);
var hash = BufferUtil.CalculateSimpleHashCode(buffer);
Enforce.That(() => buffer, BufferIs.WithValidHash(hash));
unchecked
{
buffer[Rand.Next(buffer.Length)] += 1;
}
Assert.IsFalse(Scope.IsValid(buffer, BufferIs.WithValidHash(hash)));
}