In this episode, we finish the SubmitButtonController implementation and test-drive the ResultsViewController factory.

Trouble reverted! We fix the crash in the SubmitButtonController and then refactor the tests.

Furthermore, we quickly test-drive the ResultsViewController factory implementation and update the diagrams to reflect the changes. We notice it’s time to move the Question type to the Engine module since it’s now being used by more than one module.

And… we’re done!

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