gistfile1.cs

    [TestFixture]
    public class DynamicTest
    {
        [Test]
        public void DynamicTestMethod()
        {
            dynamic result = GetRating();
            Assert.AreEqual(result.Count, 10);
            Assert.AreEqual(result.Sum, 50);
        }

        public dynamic GetRating()
        {
            return new { Count = 10, Sum = 50 };
        }
    }

On line 7, you can use "var" instead of "dynamic" too, if you want.