public void TestEqual()
        {
            var left = new Null();
            var right = new Null();
            Assert.AreEqual(left, right);
            Assert.IsTrue(left == right);
            Assert.IsTrue(left.Equals(right));
            Assert.IsTrue(left != null);
            // ReSharper disable EqualExpressionComparison
            Assert.IsTrue(left == left);
            // ReSharper restore EqualExpressionComparison
            Assert.Throws<ArgumentNullException>(() => left.AppendBytesTo(null));
            Assert.AreEqual("Null", left.ToString());

            Assert.IsFalse(left.Equals(1));
        }