unit testing - Moq object always returns null - why? -


i trying grips moq , using simple example figure out. using google geocode address. have wrapped webclient can mocked. here code:

public class position {     public position(double latitude, double longitude)     {         latitude = latitude;         longitude = longitude;     }     public virtual double latitude { get; private set; }     public virtual double longitude { get; private set; } }  public interface iwebdownloader {     string download(string address); }  public class webdownloader : iwebdownloader {     public webdownloader()     {         webproxy wp = new webproxy("proxy", 8080);         wp.credentials = new networkcredential("user", "password", "domain");          _webclient = new webclient();         _webclient.proxy = wp;     }      private webclient _webclient = null;      #region iwebdownloader members      public string download(string address)     {         return encoding.ascii.getstring(_webclient.downloaddata(address));     }      #endregion }  public class geocoder {     public position getposition(string address, iwebdownloader downloader)     {         string url = string.format("http://maps.googleapis.com/maps/api/geocode/xml?address={0}&sensor=false",                                    address);         string xml = downloader.download(url);          xdocument doc = xdocument.parse(xml);          var position = p in doc.descendants("location")                        select new position(                            double.parse(p.element("lat").value),                            double.parse(p.element("lng").value)                            );          return position.first();     } }

all far. here unit test moq:

    [testmethod()]     public void getpositiontest()     {         mock<iwebdownloader> mockdownloader = new mock<iwebdownloader>(mockbehavior.strict);         const string address = "brisbane, australia";         mockdownloader.setup(w => w.download(address)).returns(resource1.addressxml);          iwebdownloader mockobject = mockdownloader.object;          geocoder geocoder = new geocoder();         position position = geocoder.getposition(address, mockobject);          assert.areequal(position.latitude , -27.3611890);         assert.areequal(position.longitude, 152.9831570);     }

the return value in resource file , xml output google. when run unit test exception:

all invocations on mock must have corresponding setup..

if turn off strict mode, mock object returns null. if change setup to:

mockdownloader.setup(w => w.download(it.isany<string>())).returns(resource1.addressxml);

then test runs fine. don't want test string, want test specific address.

please put me out of misery , tell going wrong.

as far can tell, you're having mock return specific value when receives string "brisbane, australia", you're passing value http://maps.googleapis.com/maps/api/geocode/xml?address=brisbane,%20australia&sensor=false (or ends getting formatted).

try in test code:

… const string address = "brisbane, australia"; const string url = string.format("http://maps.googleapis.com/maps/api/geocode/xml?address={0}&sensor=false", address); mockdownloader.setup(w => w.download(url)).returns(resource1.addressxml); …

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