In this video, Mark DiFranco introduces the dependency injection container. He explains how the DI container makes implementing dependency injection much easier. A quick diagram at the end of the video explains how the DI container works under the hood.
- [Instructor] Since our classes now have…complicated initializers, we're going to need a way…to make them easier to instantiate.…A Dependency Injection Container,…or a DI container for short, can help us do this.…The container will keep a map of each class type…to an instance of that class.…We can then instantiate any class…by simply providing the type to the container.…The container then automatically provides…dependencies for the class.…Let's take a look at a quick example…to get an idea of how this works.…So on the right we have a diagram…representing our DI container.…
We would ask it for a URLSession class,…and then it would instantiate a URLSession…and provide the class back.…We can then register several of these classes.…And then when we ask for a PhotoDownloader class,…it can then create a URLSession and a URLCache class,…and then create the PhotoDownloader class for us…and return the class to us.…This allows us to create the PhotoDownloader class,…rather than having to instantiate…all of the dependencies ourselves.…
- Why write unit tests?
- What is dependency injection?
- Using protocols to help with tests
- Handling external dependencies
- Anatomy of a test case
- Writing tests
- Analyzing code coverage
- Visualizing test results
- Writing and extending UI tests
Skill Level Intermediate
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1. Dependency Injection
2. Using Protocols
3. Writing Tests
4. UI Tests
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