Frontend Testing Guide: Strategies and Practices
Frontend Testing Guide: Strategies and Practices
About the Book
In the fast-paced and ever-evolving field of front-end development, one of the biggest challenges is maintaining high-quality code while producing work rapidly. This is why testing has become so crucial. Deciding on the right testing approach and how to write and execute tests is a key issue every developer must consider. Code without tests is difficult to guarantee in terms of quality, and the solution lies in developing a solid testing strategy. This book shares the practical experience I’ve accumulated in front-end testing, with the hope of inspiring and helping others.
About the Author
Table of Contents
- Chapter 0: Front matter
- Foreword by Joey Chen
- Foreword by Eddie Gao
- Foreword by PJCHENder
- Foreword by Eric Lee
- Preface
- Table of contents
- Chapter 1: Getting started with testing
- What is front-end web testing? Why write tests?
- Types of front-end testing
- Testing techniques
- Naming conventions
- Mock, spy, and double
- Chapter review and summary
- Chapter 2: Unit testing
- Unit testing
- Environment setup, installation, and tool comparison
- Minimal scope validation logic
- How to write tests for components? A React example
- Shallow rendering and full rendering
- Chapter review and summary
- Chapter 3: Integration testing
- Integration testing
- Testing features from the user’s perspective and maximizing realism
- Mocking components, API responses, and third-party libraries
- Snapshots
- How to write tests for state management? A Redux example
- Chapter review and summary
- Chapter 4: End-to-end testing
- End-to-end testing
- Environment setup and installation
- Verifying user flow
- Chapter review and summary
- Chapter 5: Visual testing
- Visual testing
- Verifying visual accuracy
- Tool comparison
- Chapter review and summary
- Chapter 6: After writing the test, what next? When and how to perform testing
- Pre-commands and manual test invocation
- Run tests before merging code
- Running tests regularly in CI
- Inferring use case coverage from code coverage
- Chapter review and summary
- Chapter 7: FAQ
- What to do when UI updates cause test failures?
- How to handle duplicate tests?
- How to test the Timer?
- How to mock only part of a module?
- How to debug? What if an element can’t be found? How do you trace the data flow?
- How to test localization?
- How to use setup and teardown? What are beforeEach, afterEach, beforeAll, and afterAll?
- Should tests include type checking?
- Why do some test cases succeed sometimes and fail other times?
- How to run specific tests? An example using Jest
- Chapter 8: Leveraging AI for writing tests
- How to effectively use GitHub Copilot for writing tests
- How to leverage Mermaid and ChatGPT for writing tests
- Chapter 9: Summary
- Types and methods of testing
- Product stage and testing ratio
- Common types of testing
- Testing methods and tools
- Testing strategies at different stages of product development
- Leveraging AI to improve testing efficiency
- Conclusion
- Chapter 10: Keywords
- Chapter 0: Front matter
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