How can I change out value in callback using Moq? -


i'm trying mock 3rd party lib in unittest. puts result data in out parameter while returns bool signaling if more data available. want test component behaves when there 2 pages of data can't figure out how change data in out parameter in setup() method. created minimalist sample can run in linqpad:

void main() {     var m = new mock<ifoo>();      string s = "1";     var pg = 0;      m.setup(o => o.query(out s))         .returns(() => pg==0)         .callback(() => { pg++; s = "2"; });      ifoo f = m.object;      string z;     while (f.query(out z))     {         z.dump();     }     z.dump(); }  public interface ifoo {     bool query(out string result); }

the output is

1 1

how can it?

it looks changing of out parameters not supported out of box. best solution found far based on hack - see https://stackoverflow.com/a/19598345/463041. invokes private method using reflection. using hack, working solution this:

void main() {     var m = new mock<ifoo>();      string s = "1";     var pg = 0;      m.setup(p => p.query(out s))             .outcallback((out string v) => v = pg==0 ? "1" : "2")             .returns(() => pg==0)             .callback(() => { pg++; s = "2"; });       ifoo f = m.object;      string z;     while (f.query(out z))     {         z.dump();     }     z.dump(); }  public interface ifoo {     bool query(out string result); }  public static class moqextensions {     public delegate void outaction<tout>(out tout outval);     public delegate void outaction<in t1,tout>(t1 arg1, out tout outval);      public static ireturnsthrows<tmock, treturn> outcallback<tmock, treturn, tout>(this icallback<tmock, treturn> mock, outaction<tout> action)         tmock : class     {         return outcallbackinternal(mock, action);     }      public static ireturnsthrows<tmock, treturn> outcallback<tmock, treturn, t1, tout>(this icallback<tmock, treturn> mock, outaction<t1, tout> action)         tmock : class     {         return outcallbackinternal(mock, action);     }      private static ireturnsthrows<tmock, treturn> outcallbackinternal<tmock, treturn>(icallback<tmock, treturn> mock, object action)         tmock : class     {         mock.gettype()             .assembly.gettype("moq.methodcall")             .invokemember("setcallbackwitharguments", bindingflags.invokemethod | bindingflags.nonpublic | bindingflags.instance, null, mock,                 new[] { action });         return mock ireturnsthrows<tmock, treturn>;     } }

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