Testing
Testing Patterns
Confidence comes from a thoughtful test pyramid. These patterns show how to layer fast feedback with high-fidelity coverage so regressions surface before production.
Confidence comes from a thoughtful test pyramid. These patterns show how to layer fast feedback with high-fidelity coverage so regressions surface before production.
Framework-level thinking before you pick a pattern.
Specific, reusable techniques you can drop into production.
Verify that interfaces work with assistive technologies and meet WCAG standards.
Replace real API calls with controlled responses for predictable testing.
Test components in isolation to verify their behavior and output.
Verify that components correctly consume and provide context values.
Define meaningful code coverage targets that reflect actual risk areas.
Test complete user flows through the application in a browser environment.
Test explicitly how components handle errors and edge cases.
Test multiple components working together as a cohesive unit.
Intercept network requests at the service worker level for realistic testing.
Select DOM elements using accessible queries that mirror user interaction.
Capture component output and detect unintended changes over time.
Test state management logic independently from presentation.
Create reusable factories for generating test data with sensible defaults.
Simulate user events like clicks and typing to test real-world behavior.
Compare screenshots to detect unintended visual changes automatically.
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