Phase 3: Property-Based Testing for AI Code · 50 min · Python · Hypothesis · pytest

Introduction to Property-Based Testing

Don't test examples. Test invariants.

Real-world application: Engineers who can explain PBT vs example-based testing and why PBT catches AI logic errors demonstrate understanding of testing at a deeper level than most QA engineers.

What you will learn

Explain the difference between example-based and property-based testing
Identify invariants in AI-generated code that property tests should verify
Describe the history of PBT from QuickCheck to Hypothesis
Understand why PBT catches AI logic errors that example tests miss

Introduction

Introduction to Property-Based Testing

Objective

Run the PBT introduction demo showing how property-based testing catches bugs in AI-generated sort and deduplicate functions that example-based tests miss. Observe shrinking and counterexample minimization.

Don't test examples. Test invariants.

Unlock the full lesson

You've read the first 2 sections. The rest of this lesson covers The Problem, The Concept, Build, Check Yourself, Key Terms & Next — plus a hands-on lab, quiz, and project artifact.

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