public void GetShipmentAsync_Throws_HttpException()
        {
            var api = new CaseStackApiMock();

            var exception = Assert.ThrowsAsync<HttpException>(() => api.GetShipmentAsync(-1));
            Assert.True(500 == exception.GetHttpCode());
        }
        public async Task GetShipmentAsync_Data_Valid()
        {
            var api = new CaseStackApiMock();

            var shipment = await api.GetShipmentAsync(0);
            Assert.IsNotNull(shipment);
        }