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Problem mocking an index accessor

+1 vote
I'm working with the Autodesk Inventor SDK Com Interop library.

I've got a test set up where I need to return a mocked object from an indexed accessor but it gives me null instead of what I set it up to return:

            var drawing = Isolate.Fake.Instance<DrawingDocument>();
            var sheets = Isolate.Fake.Instance<Sheets>();
            var sheet = Isolate.Fake.Instance<Sheet>();
            Isolate.WhenCalled(() => sheets[null]).WillReturn(sheet);
            var testSheet = drawing.Sheets[1];

that last line throws an exception because testSheet is null. What am I doing wrong with this?
asked Jan 2 by ajw1970 (180 points)
reshown Jan 28 by leahtypemock

1 Answer

0 votes


When faking an indexer you need to pass the index into the `WhenCalled` as well (in this case the index is 1):

Isolate.WhenCalled(() => sheets[1]).WillReturn(sheet);


answered Jan 29 by Raphy (2,930 points)