public void TestBuildSibling() { // Arrange String expectedXml = "<flavors>" + "<flavor1/>" + "<flavor2/>" + "</flavors>"; // Act TagBuilder builder = new TagBuilder("flavors"); builder.AddChild("flavor1"); builder.AddSibling("flavor2"); String actualXml = builder.ToXml(); // Assert Assert.AreEqual(expectedXml, actualXml); }