Inheritance: Transform
        public void Apply_ShouldMerge(string targetXml, string transformXml, string expectedXml)
        {
            var targetDocument = ArrangeTargetDocument(targetXml);
            var transformElement = ArrangeTransformElement(targetDocument, transformXml);

            var merge = new Merge();
            merge.Apply(targetDocument.DocumentElement, transformElement);

            Assert.Equal(expectedXml, targetDocument.OuterXml);
        }