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Snapshot Testing Pattern

Snapshot testing for UI components and data structures using Vitest inline snapshots, file snapshots, property matchers, and custom serializers.

What's Included#

  • Basic component snapshot testing with toMatchSnapshot
  • Inline snapshots for small, readable outputs directly in test files
  • Object and data structure snapshots for API transformations
  • Property matchers for handling dynamic values like IDs and dates
  • File snapshots for large outputs and custom serializers for date formatting
  • Component variant testing across all combinations of props and states

Usage#

Via CLI#

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Via AI Assistant#

Ask your AI assistant:

  • "Use the snapshot testing pattern from Bootspring"
  • "Apply the Bootspring snapshot testing pattern to my project"

Key Considerations#

  • Snapshot specific elements rather than entire pages to keep diffs reviewable
  • Use inline snapshots for small outputs; they are more readable in context
  • Use property matchers (expect.any, expect.stringMatching) for dynamic values
  • Review snapshot changes carefully during code review instead of blindly updating
  • Complement snapshots with behavioral assertions; snapshots alone are not sufficient

Related Patterns#