C# – Stubbing a read only property with Rhino Mocks

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I have a class with a private set property that I want to stub out with rhino mocks. When I try to do this, though, it gives me a compile time error saying I can't set a read only property. I'm new to using Rhino Mocks so I must be missing something here…

public Interface IFoo
{
    int Quantity { get; }
}

[TestMethod]
public void SomeTest()
{
    IFoo foo = MockRepository.GenerateStub<IFoo>();
    foo.Quantity = 5;

    //Asserts and such
}

Best Answer

Use:

foo.Stub (f => f.Quantity).Return (5);

See http://ayende.com/Wiki/Rhino+Mocks+3.5.ashx#UsingExpecttosetupproperties

You can also use:

foo.Expect(f => f.Quantity).Return (5);

Related Solutions

What are the differences between mocks and stubs on Rhino Mocks

As per this

... Put simply there is a difference between Mock and Stub objects and RhinoMocks recognizes that allowing us to write tests that better state their purpose.

Mock objects are used to define expectations i.e: In this scenario I expect method A() to be called with such and such parameters. Mocks record and verify such expectations.

Stubs, on the other hand have a different purpose: they do not record or verify expectations, but rather allow us to “replace” the behavior, state of the “fake”object in order to utilize a test scenario ...

C# – tell if a property has been accessed via Rhino Mocks

Is there a way to see if the property was accessed via Rhino Mocks?

Yes. You can set up an expectation for the property. If the verification doesn't throw, then you know the property was accessed:

var mocks = new MockRepository();
IFoo foo = mocks.DynamicMock<IFoo>;
// this sets up an expectation that Name is accessed, and what it should return
Expect.Call(foo.Name).Return("John Doe"); 
mocks.ReplayAll()

// test something that uses IFoo here ...

mocks.VerifyAll();  // Throws if foo.Name was not accessed after ReplayAll()

This is all assuming that you want foo.Name to be accessed. If your goal is to verify that it is not accessed, then you should just use StrictMock instead of DynamicMock. A strict mock will throw for any unexpected calls.

Best Answer

Related Solutions

What are the differences between mocks and stubs on Rhino Mocks

C# – tell if a property has been accessed via Rhino Mocks

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