public void GetByIdThrows_When_IdDoesNotExist()
{
chainblock.Add(simpleTransaction);
Assert.Throws <InvalidOperationException>(() => chainblock.GetById(simpleTransaction.Id + 1));
}
public void GetByIdShouldThrowWhenTransactionDoesntExist()
{
chainBlock.Add(validTransaction);
Assert.Throws <InvalidOperationException>(() => chainBlock.GetById(6));
}