Unit Test your Views
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The document outlines best practices for unit testing within the Model-View-ViewModel (MVVM) architecture, particularly focusing on unit testing for models, view models, and views. It highlights the use of dependency injection and tools like Koin, Mockito, and Robolectric for facilitating tests. The presentation provides implementation details and emphasizes not testing generated code while ensuring expected outcomes from interactions and model changes.
Unit Test your Views
- 1. Unit Tests Your Views Jorge D. Ortiz-Fuentes @jdortiz
- 3. @jdortiz Agenda â Overview â Implementation details â I write tests â We write tests
- 4. Architecture
- 5. MVVM
- 6. MVVM View Model ModelView Events & Info Operations Changes Changes
- 7. Architecture Components View Model Room Activity + Fragments Events & Info Operations LiveData LiveData
- 8. Unit Testing
- 9. Testing Pyramid Acceptance test Integration tests Unit tests We are here
- 10. Unit Testing: Model View Model Room Activity + Fragments Events & Info Operations LiveData LiveData
- 11. @jdortiz Testing the Model â Use the defined operations -> Assertion on results â Connect observe changes â Donât test generated code!
- 12. Unit Testing: ViewModel View Model Room Activity + Fragments Events & Info Operations LiveData LiveData
- 13. @jdortiz Testing the ViewModel â Use mock as model â Input âą Invoke methods of the view model (used to communicate events) âą Notify of changes in the model â Output: Check if ⊠The state of the view model is the expected one ⊠It invokes expected operations in the model
- 14. Unit Testing: View View Model Room Activity + Fragments Events & Info Operations LiveData LiveData
- 15. @jdortiz Testing the View â Inputs âą Changes in the properties of the view model âą User interacting with the views â Outputs âą The view changes as expected âą It tells the viewModel about the corresponding events
- 17. @jdortiz Dependency Injection â Koin â Very simple to use â For testing: âą Provide module with mocks âą override = true âą Use AutoCloseKoinTest
- 18. @jdortiz Interacting with the Views â Robolectric (4.0) âą Runner: (AndroidJUnit4: androidx.test.ext:junit) âą Java 9 for testing Android Q âą Use Config sdk for Java 8 âą Espresso actions and matchers âą Runs on JVM
- 22. Thank you!