Testing &amp; Mocking LLM APIs in CI

Testing multi-provider LLM code without hitting rate limits

Learn how to test llm code without rate limits by mocking providers in CI, using OpenAI-compatible endpoints and deterministic fakes for multi-provider apps.

Testing LLM fallback logic with mocked provider failures

Learn how to test LLM fallback logic with mocked provider failures in pytest, covering 429s, timeouts, and CI setup for reliable AI apps.

July 17, 20262 min read

Mocking streaming LLM responses in test suites

Practical guide to mock streaming LLM responses in test suites using SSE, Python, and TypeScript for fast, deterministic CI pipelines.

Mocking LLM responses with VCR-style cassette testing

A hands-on tutorial on VCR cassette testing for LLM APIs: record HTTP interactions with Python vcrpy, sanitize cassettes, and replay them deterministically in CI.

Mocking LLM APIs with MSW for frontend testing

Learn to mock LLM API MSW frontend calls with Mock Service Worker. Step-by-step tutorial for React testing of chat UIs without live model calls.

How to snapshot-test LLM API outputs

A practical guide to snapshot testing LLM API outputs in CI: record deterministic responses, mock providers, and assert changes to catch regressions.

API integrationGuide

CI strategies for testing flaky LLM API integrations

Practical CI strategies for flaky LLM tests: mock providers, contract tests, and deterministic harnesses to keep pipelines green without sacrificing coverage.

July 17, 20264 min read

Building a fake LLM server for CI pipelines

Build a fake LLM server for CI pipelines with FastAPI and pytest to run deterministic offline tests of LLM integrations without real API calls.

July 17, 20262 min read

Mocking the OpenAI SDK for unit tests

Learn how to mock openai sdk unit tests in Python with unittest.mock and respx for deterministic CI runs without hitting live LLM APIs.

July 16, 20263 min read

Mocking OpenAI API calls in Jest and pytest

Hands-on tutorial to mock OpenAI API calls in Jest and pytest. Write fast, deterministic CI tests for LLM integrations using real SDKs.

July 16, 20263 min read