public TransactionConfirmationWatcherTests()
        {
            this.callbackRepository = Substitute.For <ICallbackRepository>();
            this.ruleRepository     = Substitute.ForPartsOf <FakeRuleRepository>();

            this.blockStorage = Substitute.For <IBlocksStorage>();
            this.blockStorage
            .GetAsync(Arg.Any <uint256>(), Arg.Any <CancellationToken>())
            .Returns(info => mockedBlocks[info.ArgAt <uint256>(0)].ToValueTuple());

            this.callbackExecuter = Substitute.For <ICallbackExecuter>();
            this.logger           = Substitute.For <ILogger <TransactionConfirmationWatcher> >();
            this.watchRepository  = new FakeWatchRepository();

            this.handler = this.subject = new TransactionConfirmationWatcher
                                          (
                this.callbackRepository,
                this.ruleRepository,
                this.blockStorage,
                this.callbackExecuter,
                this.watchRepository,
                this.logger
                                          );
            this.blockListener = this.subject;
            this.defaultUrl    = new Uri("http://zcoin.io");

            MockCallbackRepository();
        }
        public TransactionConfirmationWatcher(
            ITransactionConfirmationWatcherHandler <TContext> handler,
            IBlocksStorage blocks) : base(handler, blocks)
        {
            if (handler == null)
            {
                throw new ArgumentNullException(nameof(handler));
            }

            this.handler = handler;
        }