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Testing LLM Gateways: A Contract-Based Approach

This article details how to build a contract test suite for an LLM gateway, focusing on testing the gateway's code rather than the underlying LLM provider. It emphasizes the importance of testing the gateway's ability to maintain API contracts, handle upstream errors, and preserve unknown fields in responses. The author recommends using tools like Mock Service Worker with Node.js and TypeScript to create a fake provider for deterministic and fast testing, ensuring the gateway functions correctly without direct reliance on the LLM. AI

IMPACT Provides a method for ensuring the reliability of LLM integrations by testing the gateway layer.

RANK_REASON Article describes a method for testing software infrastructure (LLM gateways) using specific tools.

Read on dev.to — LLM tag →

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Testing LLM Gateways: A Contract-Based Approach

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  1. dev.to — LLM tag TIER_1 English(EN) · Multigrid ·

    Writing a Contract Test Suite for Your Own LLM Gateway

    <p>If you run a proxy in front of one or more model providers, the interesting failures are not in the model. They are in your layer: a header you forwarded that you should have stripped, an upstream 429 you turned into a 500, a stream you accidentally buffered.</p> <h2> The laye…