How to Test an AI Agent Without Extra LLM Calls
Test an AI agent without extra LLM calls: control the model, keep the runner real, and check tools, state, and termination.
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I'm Samuel Fajreldines I am a specialist in the entire JavaScript and TypeScript ecosystem (including Node.js, React, Angular and Vue.js) I am expert in AI and in creating AI integrated solutions I am expert in DevOps and Serverless Architecture (AWS, Google Cloud and Azure) I am expert in PHP and its frameworks (such as Codeigniter and Laravel). |
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Samuel Fajreldines I am a specialist in the entire JavaScript and TypeScript ecosystem (including Node.js, React, Angular and Vue.js) I am expert in AI and in creating AI integrated solutions I am expert in DevOps and Serverless Architecture (AWS, Google Cloud and Azure) I am expert in PHP and its frameworks (such as Codeigniter and Laravel).
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Testing
19 articles · practical guides & tutorials by Samuel Fajreldines
In-depth Testing articles, hands-on guides and tutorials by Samuel Fajreldines — 19 expert posts on Testing for software engineers.
Articles in Testing
How to Test Eventual Consistency Without Fixed Sleeps
Learn to test eventual consistency with bounded polling, observable states, and terminal failures instead of hiding problems behind a fixed sleep.
How to Regression-Test AI Agents Without Exact Text Matching
Build AI agent regression tests around behavior, trajectory, and effect. Learn what to freeze, what may vary, and how to review an intentional change.
How to Test Race Conditions in Async JavaScript
Test JavaScript race conditions with controlled Promises, an explicit invariant, and a clear boundary for the integration test that follows.
How to Test API Idempotency Without Duplicate Side Effects
Build tests for replay, concurrent requests, and reused keys in APIs by proving the observable effect instead of trusting only the happy path.
When to Use Unit vs Integration Tests in Node.js
Learn to choose unit or integration tests in Node.js by the behavior and boundary that must stay real, without following a fixed ratio.
How to Test Webhooks: Signatures, Duplicates, and Retries
Learn to test webhooks with the raw body, signatures, duplicate deliveries, retries, replays, and out-of-order events instead of only the happy path.
How to Test Retry Logic in JavaScript Without Waiting
Test JavaScript retry logic without real delays by checking attempts, backoff, pending Promises, and fake-clock cleanup for deterministic tests in CI.
How to Test Time-Dependent JavaScript Code
Test dates, setTimeout, and intervals in JavaScript with a controlled clock, async timer advancement, and cleanup that keeps tests fast.
Playwright in CI: How to Prevent Shared State Between Tests
Find out why Playwright tests pass locally and fail in CI. Isolate data, accounts, files, and fixtures before adding retries or reducing workers.
How to mock APIs in Playwright without false positives
Learn when to use route.fulfill, route.fetch, or HAR in Playwright, then pair the mock with a real check so API failures stay visible in your CI suite.
Testing AI agents: mock the model or use the real API?
Split AI agent tests into 4 layers: pure code, tools, the real model, and review. Use mocks without false confidence, then run a small real-model eval.
AI-generated Playwright tests: how to avoid false positives
Learn how to validate AI-generated Playwright tests, detect weak assertions, and require browser evidence before trusting CI.
All the Types of Tests in Software Development
Explore the comprehensive range of software development tests, from unit testing to performance testing, with real examples using JavaScript and Node.js to…
What Are End-to-End Tests and How to Implement Them with Playwright
Discover what end-to-end tests are, why they matter for modern web applications, and how to implement them using Playwright to ensure robust, reliable user…
Elevate Your Testing Strategy with Typegoose and mongodb-memory-server
Learn how to effectively use Typegoose, mongodb-memory-server, and the Service Pattern to create reliable, maintainable, and scalable tests in modern…
Mastering Web Testing with Playwright: Why It's Essential and How to Get Started
Discover why Playwright is revolutionizing web testing and learn how to create robust, reliable automated tests with this comprehensive guide.
The Ultimate Guide to Cypress: Introduction, Implementation, and Example Project
A comprehensive guide on Cypress for end-to-end testing, covering what it is, how to implement it, and building an example system.
Mastering Jest: A Complete Guide to Testing React Applications
Learn what Jest is and how to use it for testing React applications. This comprehensive guide covers everything you need to know to get started with Jest and…