Security Property-Based Testing

When to Use

• Testing that security invariants hold across many generated inputs
• Fuzz-testing parsers, validators, and input handlers
• Verifying authentication/authorization boundaries
• Testing cryptographic implementations for correctness
• Finding edge cases in input validation logic

When NOT to Use

• Testing specific known attack payloads (use unit tests)
• Load testing or performance testing
• UI testing or visual regression testing

Core Concept

Property-based testing generates thousands of random inputs and verifies that security properties always hold: