public void Attachments_GetData()
        {
            // Set test GetData method w/o parameters
            request.Setup(m => m.Get <Stream>("attachments/666/data", null)).Returns(new MemoryStream());

            // Test Get method
            var result = attachmentsProxy.GetData(666);

            // Verify test
            Assert.IsNotNull(result);
            Assert.IsTrue(result.IsSuccessful);
            Assert.IsNotNull(result.Data);
        }