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TextBoxproperty?TextBoxinstances although you might want to verify only specific behavior of the presenter. Also your interface would be something that is called a leaky abstraction.TextBoxwith a class that implements anITextBoxinterface? And why would it leak the abstraction?TextBoxin an interfaceITextBoxis fine as long as that interface really contains what you want your presenter to control/present. UsingTextBoxdirectly will couple your presenter to that particular class - it won't be trivial to replace it with other functionally equivalent implementations (for example from a UI library). Such an interface would reveal implementation choices which are (or should be) irrelevant to the presenter, that's why it would be called a leaky abstraction; it's an abstraction which leaks unnecessarily concrete details.