public void WhenCallingMethodSimultaneousThenOnlyOneExecutionOfCallout()
{
// Arrange
var logger = Substitute.For <ILogger <PhotoController> >();
var smartContract = Substitute.For <ISmartContract>();
var ctrl = new PhotoController(logger, smartContract);
var url = "https://blockathon.blob.core.windows.net/kentekens/kenteken.jpg";
// Act
ctrl.AnalyzePhoto(url);
ctrl.AnalyzePhoto(url);
// Warning: Naive test coming up
while (ctrl.IsBusy)
{
Thread.Sleep(1000);
}
// Assert
smartContract.Received(1).Callout(Arg.Is <string>(c => c == "XK50HF"));
}