您可能会发现,将XML解析为XmlDocument,并基于XPath查询来进行断言调用,比较不容易出错。以下是我经常使用的一些辅助断言方法。每个方法都需要一个XPathNavigator参数,您可以通过在XmlDocument上调用CreateNavigator()方法或获取文档中检索到的任何节点来获得它。使用示例:
XmlDocument doc = new XmlDocument( "Testdoc.xml" );
XPathNavigator nav = doc.CreateNavigator();
AssertNodeValue( nav, "/root/foo", "foo_val" );
AssertNodeCount( nav, "/root/bar", 6 )
private static void AssertNodeValue(XPathNavigator nav,
string xpath, string expected_val)
{
XPathNavigator node = nav.SelectSingleNode(xpath, nav);
Assert.IsNotNull(node, "Node '{0}' not found", xpath);
Assert.AreEqual( expected_val, node.Value );
}
private static void AssertNodeExists(XPathNavigator nav,
string xpath)
{
XPathNavigator node = nav.SelectSingleNode(xpath, nav);
Assert.IsNotNull(node, "Node '{0}' not found", xpath);
}
private static void AssertNodeDoesNotExist(XPathNavigator nav,
string xpath)
{
XPathNavigator node = nav.SelectSingleNode(xpath, nav);
Assert.IsNull(node, "Node '{0}' found when it should not exist", xpath);
}
private static void AssertNodeCount(XPathNavigator nav, string xpath, int count)
{
XPathNodeIterator nodes = nav.Select( xpath, nav );
Assert.That( nodes.Count, Is.EqualTo( count ) );
}