Flutter TDD Clean Architecture Course [2] – Entities & Use Cases

Summary

This tutorial delves into applying clean architecture principles to a Flutter app development, focusing on the number trivia app. It guides through setting up the project structure, creating essential entities, and implementing test-driven development. The instructor discusses the importance of starting with the domain layer, using packages for state management and API calls, and emphasizes the simplicity of entities and the business logic within use cases. The video also covers error handling, functional programming concepts, and the creation of repository contracts for better testability and separation of concerns.

Takeaways

• 📝 The video is a tutorial on applying clean architecture principles to a Flutter app development, specifically for a number trivia app.
• 🎨 The presenter emphasizes the importance of starting app development with the UI and user experience, even though the coding process will begin from the innermost stable layers.
• 📚 Clean architecture, as proposed by Uncle Bob, is introduced, highlighting the need to start coding from the domain layer, specifically with entities.
• 🛠️ The tutorial includes practical steps to set up the project's structure with empty folders for the presentation, domain, and data layers, which will later be filled with code.
• 📦 The 'pubspec.yaml' file is used to manage dependencies and devDependencies for the Flutter project, with packages added to facilitate state management, API calls, and testing.
• 🔍 The creation of the 'number_trivia' entity is detailed, based on the JSON response from the API, focusing on the 'text' and 'number' fields as essential data for the app.
• 🔧 The use of the 'Equatable' package is explained to handle value equality in Dart objects, simplifying the comparison of objects with the same data.
• 🤔 The concept of use cases is introduced as a way to encapsulate business logic, with the presenter discussing the need for error handling and the use of 'Future' and 'Either' types for asynchronous operations and functional programming.
• 📝 The tutorial outlines the process of creating a contract for the repository in the domain layer and its concrete implementation in the data layer, emphasizing testability and separation of concerns.
• 🔬 Test-driven development (TDD) is adopted throughout the tutorial, with tests written before production code to ensure only necessary functionality is implemented, adhering to the YAGNI principle.
• 🔄 The presenter demonstrates creating a test for the 'getConcreteNumberTrivia' use case, using mocking to simulate repository behavior and asserting that the correct methods are called with the correct parameters.

The video is abnormal, and we are working hard to fix it.
Please replace the link and try again.