Question

I’m trying to test a method. I want to ensrur that there is a method call in that method (calling service) the code look like this:

using(proxy = new Proxy()) {        proxy.CallService(); } 

I swap the proxy with fake object (using TypeMock) but get error because of the fake object disposed in the end of block. I don’t want to remove that ‘using’ block. Thanks

Answer 1

Disclaimer: I work at Typemock
If you are using the Arrange Act Assert API you can use Members.ReturnRecursiveFakes when you are creating your fake object (Note: this is the default from version 5.2.0) This will automatically fake the Dispose method as well.

so your test will be something like this:

var fake = Isolate.Fake.Instance<Proxy>(Members.ReturnRecursiveFakes); Isolate.WhenCalled(() => fake.CallService()).IgnoreCall(); Isolate.Swap.NextInstance<Proxy>().With(fake);  UnderTest classUnderTest = new ClassUnderTest(); classUnderTest.MethodUnderTest(); // assuming the Proxy instance is used here.  Isolate.Verify.WasCalledWithAnyArguments(()=>fake.CallService()); 

I want to add to what Jon Skeet said that I would create a separate test that will ensure that the Dispose method is called.
I think it is a good practice to assert one thing in each test method, that way when a test breaks up you’ll know the reason immediately.