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Screenshot testing: Gotta Catch 'Em All
- UI/UX testing in medium to large applications can be challenging, requiring creation of test users and database population.
- Decoupling UI/UX testing from the backend simplifies tasks such as verifying buttons and error messages without full business process understanding.
- Developing custom dev tools can enable faster validation of new frontend features and testing without backend dependencies, improving efficiency.
- Screenshot testing, a form of assertion testing, offers a quicker alternative to end-to-end testing for checking design consistency.
- Frontend unit tests focusing on logic rather than styles are essential, but testing without a browser environment may overlook design issues.
- Using tools like Storybook.js aids in quickly navigating UI components, allowing for easy creation of user flow stories for testing.
- Implementing Docker for screenshot testing offers platform agnosticism and consistent browser versions across different environments.
- Loki, a tool for screenshot testing, automates the process of capturing and comparing screenshots for UI validation.
- Writing screenshot tests involves creating React components, defining stories for components, and running tools like Loki to compare screenshots for design changes.
- Best practices for writing stories include isolation from backend, avoiding side effects, and treating components and stories as functions for consistency.
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