I have a data source (it’s a spread sheet). I want to test that my system reads it in properly and that the model is populated properly. Like a good object should, my key object knows how to populate itself from a Worksheet Object or a File. It’s the reading of the sheet I want to test. How can I do this without breaking the law of Demeter? I.e. without exposing the state of the object to the test client (Fit and NUnit in this case) via getters?

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