How to mock System.DirectoryServices.SearchResult?

Question

If you have a method that needs to be tested that takes a list of SearchResults

public virtual void ProcessResults(IList<SearchResult> list)
{
    //Code to tests here
}

How do you mock up that list of SearchResult?

Note: No low-level injection frameworks (eg TypeMock) allowed.

Answer 1

Currently i have this ugly code

public static class SearchResultFactory
{
    const BindingFlags nonPublicInstance = BindingFlags.NonPublic | BindingFlags.Instance;
    const BindingFlags publicInstance = BindingFlags.Public | BindingFlags.Instance;

    public static SearchResult Construct<T>(T anonInstance)
    {
        var searchResult = GetUninitializedObject<SearchResult>();
        SetPropertiesFieled(searchResult);
        var dictionary = (IDictionary)searchResult.Properties;
        var type = typeof(T);
        var propertyInfos = type.GetProperties(publicInstance);
        foreach (var propertyInfo in propertyInfos)
        {
            var value = propertyInfo.GetValue(anonInstance,null);
            var propertyCollection = GetUninitializedObject<ResultPropertyValueCollection>();
            var innerList = GetInnerList(propertyCollection);
            innerList.Add(value);
            var lowerKey = propertyInfo.Name.ToLower(CultureInfo.InvariantCulture);
            dictionary.Add(lowerKey, propertyCollection);
        }
        return searchResult;
    }

    private static ArrayList GetInnerList(object resultPropertyCollection)
    {
        var propertyInfo = typeof(ResultPropertyValueCollection).GetProperty("InnerList", nonPublicInstance);
        return (ArrayList) propertyInfo.GetValue(resultPropertyCollection, null);
    }

    private static void SetPropertiesFieled(SearchResult searchResult)
    {
        var propertiesFiled = typeof(SearchResult).GetField("properties", nonPublicInstance);
        propertiesFiled.SetValue(searchResult, GetUninitializedObject<ResultPropertyCollection>());
    }

    private static T GetUninitializedObject<T>()
    {
        return (T) FormatterServices.GetUninitializedObject(typeof(T));
    }
}

which is used...

var searchResult = SearchResultFactory.Construct(new
                                                 {
                                                     name = "test1",
                                                     givenName = "John",
                                                     sn = "Smith"
                                                 });

Answer 2

You could write your own wrapper class around the SearchResult, implement some ISearchResult interface.

Your concrete implementation uses the SearchResult class internally exposing as much as you require, and then you can mock the Interface at testing.