public void CallingGetAnnotationReturnsStream()
{
var dataAccessMock = new Mock <IImageRepository>();
var stream = new MemoryStream();
stream.WriteByte(1);
dataAccessMock.Setup(x => x.GetAnnotationContent(It.IsAny <string>())).Returns(stream);
var controller = new ImagesController(dataAccessMock.Object, null, null);
var guid = Guid.NewGuid().ToString();
var result = controller.GetAnnotation(guid);
//check if its image/jpeg
Assert.NotNull(result);
}