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Take a stab at test friendly architecture Brian Gardner
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Goals ● Principles & Patterns ● Where DI can help ● Testing setup
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Quick Pit Stop
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Sample Application
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List Screen Dependencies
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Create Screen Dependencies
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Cleaner Architecture Patterns
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Single Responsibility Principle
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Do one thing and do it well
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Smaller api == smaller tests
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UI Architecture Selection ● MVC ● MVP ● MVVM ● VIPER
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Sample Architecture
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Bias Towards Interfaces Composition vs Inheritance What it does vs. what it is
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Example Refactor
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Finding an interface instead of using a concrete class helps with testing
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Explicit Dependencies
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Implicit Dependencies
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Implicit Dependencies
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Explicit Dependencies
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Recap ● SRP ● UI Architecture ● Bias Towards Interfaces ● Explicit Dependencies
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Dependency Injection
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Dagger Recap
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Dagger Recap
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Dagger recap
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Dagger recap
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Applying the tools
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Single Responsibility Principle
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Doesn’t really help here
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Apply SRP to Dependency Injection
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Apply SRP to Dependency Injection
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UI Architecture Patterns
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Also doesn’t really help
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Bias Towards Interfaces
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Injecting Interfaces
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Different Interface Injection
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Explicit Dependencies
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Perfect Tool For The Job
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Perfect Tool For The Job
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Recap 2 ● Use SRP on injection code ● Not relevant for UI architecture ● Flexible for providing interfaces ● Perfect for explicit dependencies
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Testing Time!
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Unit Testing
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Don’t use it for unit testing
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Remember This?
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Remember This?
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No Need For DI
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Integration Testing
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Fakes?
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Module For Fake
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Test Component
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Test Application
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Custom Test Runner
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Supply Test Application
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Using Custom Test Runner
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Example Integration Test
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Small issue
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Unused Test Runner
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What About Robolectric?
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Custom Robolectric Application
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Conclusion
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Who is this guy? Brian Gardner @bgardner7 Big Nerd Ranch We Teach, We Develop, We Write