property-based-testing
Property-Based Testing
fast-check patterns for JavaScript/TypeScript that find edge cases unit tests miss. Includes 6 canonical property categories with worked examples targeting agent-studio's own utilities.
When to Use
- New utility functions (path normalization, parsers, transformers)
- Bug fixes where the fix has a general invariant (not just the specific repro case)
- Security-sensitive string handling (avoid escaping bugs, injection vectors)
- Any function where "this property should hold for ALL inputs" can be stated
The 6 Canonical Property Categories
1. Inverse Operations (Round-trip)
import fc from 'fast-check';
// If you serialize then deserialize, you get back the original
fc.assert(
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