You Can't Unit-Test an LLM. Here's What I Built Instead.
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Every team shipping an LLM feature eventually hits the same wall: the thing you built is non-deterministic, and your whole testing culture assumes it isn't. assertEqual(output, expected) is meaningless when the output is a paragraph of generated prose that will be slightly different next time. The usual responses are both bad. One is to shrug and ship it with no verification at all: "it looked good when I tried it." The other is to test the model itself, chasing a moving target that changes…
1Key Takeaways
- Every team shipping an LLM feature eventually hits the same wall: the thing you built is non-deterministic, and your whole testing culture assumes it isn't.
- assertEqual(output, expected) is meaningless when the output is a paragraph of generated prose that will be slightly different next time.
- One is to shrug and ship it with no verification at all: "it looked good when I tried it." The other is to test the model itself, chasing a moving target that changes….
2AIWedia Score
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — AI reports that every team shipping an LLM feature eventually hits the same wall: the thing you built is non-deterministic, and your whole testing culture assumes it isn't.
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