How to fake an object in NSubstitute and ignore its internal implementation method?

Question

I am new to NSubstitute and trying to fake an existing class called OrgDataWS. This class has a method called "GetDataSet":

 public XmlElement GetDataSet(int token)
 {
        string perfLogMessage = string.Format("Org.GetDataSet: {0}", Guid.NewGuid().ToString());
        MultiMessagePerformanceCounter performanceCounter = MultiMessagePerformanceCounter.StartNew(perfLogMessage);
        XmlElement result = orgDataManager.GetDataSet(token);
        performanceCounter.Stop();

        return result;
 }

Following are my testing methods:

 [TestMethod]
 public void GetDataSetTest()
 {
      var dataWSStub = Substitute.For<OrgDataWS>();

      var orgManagerStub = Substitute.For<OrgDataManager>();

      var document = new XmlDocument();
      var xmlElement = document.CreateElement("a");
      orgManagerStub.GetDataSet(Arg.Any<int>()).Returns<XmlElement>(xmlElement);


      dataWSStub.OrgDataManager = orgManagerStub;


      var result = dataWSStub.GetDataSet(99);
 }

However, when I run my testing methods, this line is "orgManagerStub.GetDataSet (Arg.Any ()). Returns (xmlElement);" threw an exception. This exception is due to the implementation of the "OrgDataManager" class, from my understanding, this should not happen. The purpose of using this sentence is that I hope that if the orgManagerStub DataDataSet method is called with any Int parameter, just return an xmlElement instance. I did not hope that my code would launch a detailed implementation of OrgDataManager.

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Answer 1

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