public void CanGrabValue()
{
var client = new Client(new Uri(AmeeUrl), AmeeUserName, AmeePassword);
var dataItemResponse = client.GetDataItem("transport/defra/fuel", "9DE1D9435784");
var dataItemValue = dataItemResponse.DataItem.ItemValues.First(v => v.ItemValueDefinition.Path == "massTotalCO2ePerVolume").Value;
Assert.AreEqual("0.54362", dataItemValue);
}