unit testing against an interface. [Answered]RSS

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  billcrawley

  Member

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  551 Posts

  unit testing against an interface.

  Dec 03, 2014 07:16 AM|billcrawley|LINK

  HI all,

  I had a set of unit tests that was working originally because they were written against a specific class i.e.

  protected List<SWReportItem> _results;
  
          protected override void Because_of()
          {
              base.Because_of();
              _results = _service.GetSWNewJoiners(1);
          }
  
  [TestMethod]
          public void then_the_pre_rdr_charge_Basis_is_populated()
          {
              _results.ForEach(c => c.PreRDRChargeBasis.ShouldEqual("PreRDRChargeBasis"));
          }

  This worked fine as _service.GetSWNewJoiners(1) returned a list<SWReportItem>

  As the code has been re-factored this method now returns a list of interfaces.

  And ultimately gets populated with :

  List<ICurrentSelectionProviderReportItem> result = new List<ICurrentSelectionProviderReportItem>();
              SWReportItem reportItem = null;
              foreach (BasePensionReportItem item in newJoinerSelections)
              {
                  reportItem = new SWReportItem(item);
                  PopulateItem(reportItem);
                  result.Add(reportItem);
              }
              return result;

  So as you can see ultimately the interface has been populated with a typeof(SWReportItem)

  normally I might do something like:

  var castObject = _result.Where(c => c.GetType() == typeof(SWReportItem)).Cast<SWReportItem>().ToList());
  
  
  

  However in this scenario I haven't got the Where clause available to me, as I would have then performed the test against my variable.

  I thought then that I could do something like:

   _results.ForEach(c => c.GetType() == typeof(SWReportItem).GetMember("PreRDRChargeBasis").ShouldEqual("PreRDRChargeBasis"));

  but it still complains. How should I re-write my test

• • Reply
  billcrawley

  Member

  202 Points

  551 Posts

  Re: unit testing against an interface.

  Dec 03, 2014 07:26 AM|billcrawley|LINK

  [TestMethod]
          public void then_the_pre_rdr_charge_Basis_is_populated()
          {
              foreach (SWReportItem reportItem in _results)
              {
                  reportItem.PreRDRChargeBasis.ShouldEqual("PreRDRChargeBasis");
              }
              
          }