SetupMockIAP.cs

private void SetupMockIAP()
{
            MockIAP.Init();

            MockIAP.RunInMockMode(true);
            MockIAP.SetListingInformation(1, "en-us", "A description", "1", "TestApp");

            // Add some more items manually.
            ProductListing p = new ProductListing
            {
                Name = "img.2",
                ImageUri = new Uri("/Res/Image/2.jpg", UriKind.Relative),
                ProductId = "img.2",
                ProductType = Windows.ApplicationModel.Store.ProductType.Durable,
                Keywords = new string[] { "image" },
                Description = "An image",
                FormattedPrice = "1.0",
                Tag = string.Empty
            };
            MockIAP.AddProductListing("img.2", p);
}