public async Task DeletesCorrectUrl()
            {
                var connection = Substitute.For <IApiConnection>();
                var client     = new ProductsClient(connection);

                await client.DeleteFollower(123, 1234);

                Received.InOrder(async() =>
                {
                    await connection.Delete(Arg.Is <Uri>(u => u.ToString() == "products/123/followers/1234"));
                });
            }