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How can I test that an internal property was set with a specific value during a method call

+2 votes

I am trying to unit test an AspNetCore.Mvc controller with Typemock. Here is the top layer of the controller code. 

        [HttpPost(UriFactory.FOO_ROUTE)]
        public async Task<ActionResult> AddFooAsync([FromRoute]string novelid, [FromBody]AddFoo command)
        {
            var novel = await RetrieveNovel(novelid);
            if (novel == null) return NotFound();
 
            if (!ModelState.IsValid) return BadRequest(ModelState);
 
            command.FooId = Guid.NewGuid();
            novel.AddFoo(command);
            await _store.SaveAsync(novel);
            return Created(UriFactory.GetFooRoute(novel.Novel.NovelId, command.FooId), command);
        }
 
Here is the test code I've written so far..
 
    [TestClass, Isolated]
    public class FooController_UnitTests
 
        [TestMethod, Isolated]
        public async Task TestMethod()
        {
 
            //Arrange
            string novelid = "0";
            Novel controllerUnderTest = Isolate.Fake.Dependencies<Novel>();
 
            //Fake Foo
            var ValidTestFoo = Isolate.Fake.Dependencies<AddFoo>();
            
            //Fake the RetrieveNovel(novelid) call
            Isolate.NonPublic.WhenCalled(controllerUnderTest, "RetrieveNovel").WillReturn(Task.FromResult(new GenreNovel()));
 
            //Fake the ModelState
            Isolate.WhenCalled(() => controllerUnderTest.ModelState.IsValid).WillReturn(true);
 
            //Fake FooId
            Isolate.NonPublic.Property.WhenGetCalled(ValidTestFoo, "FooId").WillReturn(Guid.NewGuid());
            
            //Act
            var fooResponse = controllerUnderTest.AddFooAsync(novelid, ValidTestFoo);
 
            //Assert
            //that RetrieveNovel(novelid) is called 
            Isolate.Verify.NonPublic.WasCalled(controllerUnderTest, "RetrieveNovel");
 
            //that (!ModelState.IsValid) is called
            Isolate.Verify.WasCalledWithAnyArguments(() => controllerUnderTest.ModelState.IsValid);
 
            //that command.FooId was set with a Guid.NewGuid();
            Isolate.Verify.NonPublic.Property.WasCalledSet(ValidTestFoo, "FooId").WithArgument(Guid.NewGuid());
}
}

FooId is an internal property of AddFoo. Right now I am trying to test that the FooId was set as a consequence of the AddFooAsync method logic, AND that it was set with a Guid.NewGuid.

My other 2 Verifies are passing but when I run the test with the last verify I get ....

  TypeMock Verification: Property blahblahblah was called with mismatching arguments.
 
Thanks! 
asked by wayne
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 (1.2k points)

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