Automated Testing

Let automated tests verify the correctness of AI-generated code

Core Concept

In AI-assisted development, automated testing tools are not replaced by AI, but serve as reliable verification mechanisms integrated into the Agent’s feedback loop.

AI + Testing Collaboration Loop

AI Generates Code

AI Agent quickly generates functional code

Run Test Suite

Automated tests check functional correctness

Get Failure Report

Extract failed cases, expected vs actual values

AI Targeted Fixes

AI fixes based on specific error messages

Repeat Until Passing

Loop until all tests pass

Division of Work

Role	Strengths
AI	Quickly generate functional code, explore implementation solutions, refactor logic
Automated Tests	Check functional correctness, boundary conditions, regression issues, integration behavior

This division is more efficient and reliable than “letting AI self-verify”:

Tests provide objective, repeatable deterministic feedback
Avoids AI hallucinations, self-consistent bias, or missed edge cases
Naturally fits existing engineering practices (CI/CD, TDD/BDD)

Testing Framework Quick Reference

Language	Unit Testing	Component/Integration	E2E Testing
TypeScript	Vitest / Jest	Testing Library	Playwright / Cypress
Python	PyTest	PyTest	Playwright / Selenium
Java	JUnit 5	Spring Boot Test	Selenium
Go	testing	testify	chromedp

JavaScript / TypeScript Testing

Recommended Frameworks

Framework	Type	Features	Recommendation
Vitest	Unit Testing	Fast, integrates with Vite	⭐⭐⭐
Jest	Unit Testing	Mature, rich ecosystem	⭐⭐
Testing Library	Component Testing	User-perspective testing	⭐⭐⭐
Playwright	E2E Testing	Cross-browser, reliable	⭐⭐⭐
Cypress	E2E Testing	Great developer experience	⭐⭐

Python Testing

Recommended Frameworks

Framework	Type	Features	Recommendation
PyTest	Unit/Integration	Flexible, rich plugins	⭐⭐⭐
unittest	Unit Testing	Standard library, stable	⭐⭐
pytest-asyncio	Async Testing	Async code support	⭐⭐⭐
pytest-cov	Coverage	Coverage reporting	⭐⭐⭐

Java Testing

Framework	Type	Features
JUnit 5	Unit Testing	Modern, feature-rich
Mockito	Mock Framework	Easy-to-use mocking
AssertJ	Assertion Library	Fluent assertion API
Spring Boot Test	Integration Testing	Spring ecosystem integration

Test Types Explained

Type	Purpose	Speed	Coverage Scope
Unit Tests	Test single functions/methods	🚀 Fastest	Fine-grained
Component Tests	Test UI component behavior	⚡ Fast	Component level
Integration Tests	Test module interactions	🏃 Medium	Module level
E2E Tests	Test complete user flows	🐢 Slower	Global

AI Collaboration Best Practices

Test-Driven AI Development (TDD)

Step	Actor	Description
1. Write Tests	Human	Define expected behavior first
2. Implement Code	AI	Implement based on tests
3. Run Tests	Automation	Verify implementation
4. Fix	AI	Fix based on failure reports

Feeding Test Failures to AI

Effective feedback should include:

Information	Description
Test Case Name	Which test failed
Expected Value	What was expected
Actual Value	What was actually received
Related Code Location	File and line number
Stack Trace	Error stack (if available)

Coverage-Driven

Practice	Description
Generate coverage reports	Understand which code isn’t tested
Set coverage thresholds	e.g., 80% line coverage
Have AI supplement tests	Generate tests for uncovered branches

Configuration Checklist

Category	Check Item
Framework	✅ Test framework installed and configured
Environment	✅ Test environment isolated (e.g., jsdom)
Coverage	✅ Coverage tool configured
CI Integration	✅ Tests run automatically in CI
Mocking	✅ Mock tools ready (e.g., vi.fn/Mock)
Data	✅ Test data/fixtures organized

Next Steps

After configuring the testing framework, set up CI/CD Pipeline to automate the entire development process.