A common approach people take with testing is mocking. Specifically defining interfaces for dependencies which are then typically mocked so you can test in isolation. While interfaces can be helpful for mocking as well as fakes and stubs, there can be other approaches taken. Meaning you don't need to create an interface for everything.
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0:00 Intro
1:04 Interface
4:53 Delegate/Functions
7:09 Data
8:10 Level
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