At this velocity, flaky tests become an inevitable force of nature. PostHog's test pass rate is 99.98%, which is genuinely excellent across 22,477 tests. But at 33 million weekly test executions, even a tiny failure rate produces a meaningful amount of noise. That's just math.
Initially, when we set out to build this product, we wanted a fully agentic solution. At the time, the tech wasn't there. It was GPT-4 era (not 4o, just 4). The models were so bad that we needed to build huge guardrails and give them very accurate information in order for them to kind of work. We built huge Playwright and Appium wrappers that would do very complex inspections over the code and extract a bunch of information. I'm proud to say that none of the open source solutions I've seen come close to the level of sophistication and replicability we built. We had like 7 clicking strategies that would self-heal on the fly if something changed, for example. That made running tests super fast and reliable.
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Nscale, a UK company vital to the government’s AI ambitions, has raised $2bn (£1.5bn) in a funding round and appointed the former Meta executives Sheryl Sandberg and Nick Clegg to its board of directors.
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