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Mock a Field

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Colan asked on 27 Nov 2011, 05:16 AM
Trying to mock a class provided by a vendor that contains a number of public fields.

Either I'm not arranging the mock properly or JustMock does not support mocking fields. 

Sample code

// sample class to mock
public class HasFields
      public string FieldA;

// code to set up mokc
    var mock = Mock.Create<HasFields>();
    Mock.Arrange (() => mock.FieldA).Returns("it works");

When executed the Mock.Arrange call throws the error:

Telerik.JustMock.MockAssertionException: Lambda must contain a valid method to procceed

In the test code if the field is changed to a property, the Mock.Arrange works. 

Unfortunately changing the field to a property isn't an option with the classes provided by a vendor.

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answered on 28 Nov 2011, 10:46 AM
Hi Colan,

Thank you for bringing up the question. Unfortunately, you can not mock a field since mocking happens by intercepting method body therefore you can mock properties (which has a get/ set method), events (add / remove method) and other methods.

This is not something limited for JustMock but it is more or less general and the nature of .net IL.

Kind Regards,
the Telerik team

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