public async Task TestDeleteProductSuccess()
{
//Should update Collection by deleting a product from its list
var result = await controller.AddProduct(1, 1);
result = await controller.DeleteProduct(1, 1);
Assert.IsType <OkObjectResult>(result);
OkObjectResult new_res = (OkObjectResult)await controller.GetCollection(1);
CollectionDTO new_dto = (CollectionDTO)new_res.Value;
//Information inside the retrived CollectionDTO should be updated
Assert.Equal("Test_Collection", new_dto.collectionName);
Assert.Equal("Mock_Parameter", new_dto.aestheticParameter);
Assert.True(1 == new_dto.CollectionId);
Assert.True(0 == new_dto.products.Count);
}