public void acknowledge_RESULT_OK()
{
// arrange
var key = "test_key";
_storageService.Add(key, "whatever object", null);
Guid faceId = Guid.NewGuid();
Guid personId = Guid.NewGuid();
var faceServiceMock = new Mock <IFaceServiceClient>();
var obj = new FaceController(Services.GetRequiredService <IHostingEnvironment>(), faceServiceMock.Object, _storageService);
// act
var result = obj.Acknowledge(key);
// assert
var storageObject = _storageService.Get(key);
Assert.Null(storageObject);
}