How to mock XmlNode

Hi,

You can fake the XML document and children using similar code:

[TestMethod]
public void TestXMLAttributes()
{
    // Arrange
    var root = Isolate.Fake.Instance<XmlElement>();

    var elementOne = Isolate.Fake.Instance<XmlElement>();
    Isolate.WhenCalled(() => elementOne.Attributes[0].Value).WillReturn("Value1");
    
    var elementTwo = Isolate.Fake.Instance<XmlElement>();
    Isolate.WhenCalled(() => elementTwo.Attributes[0].Value).WillReturn("Value2");

    Isolate.WhenCalled(() => root.ChildNodes)
              .WillReturnCollectionValuesOf(new[] { elementOne, elementTwo });

    // Act
    var actualAttributes = new List<string>();
    foreach (XmlNode childNode in root.ChildNodes)
    {
        actualAttributes.Add(childNode.Attributes[0].Value);
    }

    // Assert
    CollectionAssert.AreEquivalent(new []{"Value1", "Value2"}, actualAttributes);
}

In this example we created an XML element, faked its children list and set child attributes behavior to return specific values.

I am not sure what exactly are you trying to test in your code. Since XML is easy to create data object, it may be easier to use real XML document instead of fake. It will also make the test more readable and less fragile. If you're not verifying anything against the XML there is no must to fake it.

Regards,
Elisha
Typemock Support

Thanks for reply...

Actualy i am still stuggling with same issue. When i tried to create the mock object named as "root" from the XmlDocument then it is throwing object reference error. Befor the foeeach loop there is lines of code as:

 Hashtable languageTable = new Hashtable();
            string cultureName = currentInfo.Name;
            XmlDocument doc = new XmlDocument();
            XmlTextReader myReader = new XmlTextReader(xmlUrl);
              myReader.XmlResolver = myResolver;
                doc.Load(myReader);
                XmlNode root = doc.ChildNodes[1];
            foreach (XmlNode node in root.ChildNodes)   \Here it breaks 
                {
                    if (string.Compare(node.Name, "token", true) != 0) continue;

I am able to mock the "XmlDocument" and its load call. But when its trying to fetch the first child node, it returns me null object.

Please share some inputs that how can i mock the first element of the XML document as XMLNode("root").

Thanks
Mohit

Hi,

You can handle it using indexer faking:

Isolate.WhenCalled(() => doc.ChildNodes[1]).WillReturn(fakeElement);

Regards,
Elisha
Typemock Support