public async Task HeartsBeating_AllReturnFalse_IfInternalException()
        {
            var heartbeat = new ApiHeartbeat(
                this._exchangeRateApi,
                this._marketApi,
                this._ruleApi,
                this._enrichmentApi,
                this._logger);

            A.CallTo(() => this._exchangeRateApi.HeartBeatingAsync(A <CancellationToken> .Ignored))
            .Throws <ArgumentNullException>();
            A.CallTo(() => this._marketApi.HeartBeatingAsync(A <CancellationToken> .Ignored)).Returns(Task.FromResult(true));
            A.CallTo(() => this._ruleApi.HeartBeatingAsync(A <CancellationToken> .Ignored)).Returns(Task.FromResult(true));

            var result = await heartbeat.HeartsBeating();

            Assert.AreEqual(result, false);
        }