React Native VS react-testing-library

• Cross-platform development
  React Native allows developers to write code once and use it to build applications for both iOS and Android platforms, significantly reducing development time and effort.
• Performance
  React Native uses native components under the hood, providing better performance compared to hybrid technologies like Cordova or Ionic.
• Community support
  React Native has a large and active community, which means plenty of libraries, tools, and support are available to help developers solve problems and add features.
• Hot reloading
  React Native supports hot reloading, enabling developers to see the results of the latest change instantly without losing the application's state.
• Reusable components
  Developers can use React Native's component-based architecture to create reusable UI components, making code more modular and easier to maintain.
• Strong backing
  Backed by Facebook, React Native benefits from continuous development, regular updates, and a high level of reliability and stability.

Possible disadvantages

• Complexity for advanced features
  Implementing complex features and achieving deep integrations with native APIs may require more effort and a good understanding of native programming.
• Performance limitations
  While React Native performs well for most use cases, it may still fall short in performance-intensive applications compared to fully native solutions.
• Limited third-party libraries
  Some third-party libraries might not be available for React Native, or they may lack features compared to their native counterparts.
• Platform-specific code
  Despite being cross-platform, certain features might still require platform-specific code, increasing the complexity when developing for both iOS and Android.
• Potential for outdated documentation
  As React Native evolves quickly, some documentation or tutorials might become outdated, leading to confusion and extra effort to find up-to-date information.
• Size of the application
  React Native applications tend to have larger file sizes compared to their native counterparts due to the inclusion of the JavaScript runtime and other dependencies.

• Focused on user-centric testing
  React Testing Library encourages tests that closely resemble how users interact with an application. This approach makes tests more reliable and meaningful.
• Reduces coupling to implementation details
  By encouraging developers to interact with components via the DOM, the library minimizes dependencies on component internals, making tests less prone to breaking from refactors.
• Improved test readability
  Tests written with React Testing Library are generally easier to read and understand because they focus on what the user sees and does, rather than the internal logic of the components.
• Comprehensive query options
  The library provides a wide range of query methods (e.g., getByText, getByRole), which makes it easy to select elements in ways that resemble how users think.
• Active community and well-maintained
  React Testing Library has a strong, active community and it's maintained by experienced developers who keep the library up-to-date with React's evolution.

Possible disadvantages

• Limited support for non-DOM testing
  The library is heavily focused on DOM interactions, making it less suited for testing non-DOM logic or scenarios that don't involve user interactions.
• Can be slower
  Tests that involve the DOM can be slower compared to tests that interact directly with component methods and state, which can lead to longer test execution times.
• Learning curve for traditional testers
  Developers who are used to testing implementation details with other tools (like Enzyme) might find it challenging to adjust to the user-centric approach advocated by React Testing Library.
• Potential for less granular control
  Because the library encourages testing through the UI, developers might find it harder to test specific, isolated internal behaviors of components that aren't directly visible to users.
• Dependencies on browser APIs
  The library's reliance on browser APIs means that tests may behave differently in different environments or may require polyfills for certain features, leading to potential inconsistencies.

React Native in 2019 & Beyond

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React unit testing with Jest & React-testing-library

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