public void IsDBNull_GivenNullOrdinal_ReturnsTrue()
        {
            // arrange
            var sut = new CacheableDataReader(actualDataReader);
            sut.Read();

            // act
            var isNull = sut.IsDBNull(sut.GetOrdinal("NullColumn"));

            // assert
            Assert.That(isNull, Is.True);
        }