public async Task GetTickerData_CallsTickerClient_ToGetTickerData()
        {
            //Arrange
            _tickerClient.Setup(x => x.GetTickerData()).ReturnsAsync(new HttpResponseMessage
            {
                StatusCode = HttpStatusCode.OK,
                Content    = new StringContent(ClientData.TickerResponseContent, System.Text.Encoding.UTF8, "application/json")
            });

            //Act
            var result = await _service.GetTickerData();

            //Assert
            _tickerClient.Verify(x => x.GetTickerData(), Times.Once);
        }