Join Chiu-Ki Chan for an in-depth discussion in this video Dagger, part of Advanced Android Espresso Testing.
- [Instructor] Let's review how we used dependency injection…to create a hermetic environment for testing.…In our app,…we have our greeting application providing a clock…which gives us the current time.…During tests however, we have a test application…which provides a clock that has a fixed time.…In this example, we have a single dependency, clock.…So it is not too difficult…to do this dependency injection by hand.…
However most of our applications have multiple dependencies…and they may depend on each other.…For an example, a weather app may use a database…to store a list of cities…and shared preferences to remember…if the user prefers Celsius or Fahrenheit.…Both of them requires an android context to be created.…And then it may depend on the network library…to fetch the weather.…
When we have a dependency graph like this,…managing all the provide functions by hand…in the application, can get complicated.…Fortunately, there are dependency injection libraries…that can compute the dependency graph for you…and help you create them.…
- Incoming and outgoing intents
- How intents are used
- Dependency injection
- Why extract dependencies?
- Mockito and Dagger
Skill Level Advanced
Android App Development: Data Persistence Librarieswith Annyce Davis4h 52m Intermediate
Effective Android Testing for Mobile Developerswith Chiu-Ki Chan2h 56m Intermediate
2. Hermetic Test Environment
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