The Net Beneath the Velocity: Automating Test Coverage at Nirvana
*As we ship faster with AI, the test net underneath has to keep up or speed becomes risk.* AI has changed how much code we produce and how fast it lands. But every line still has to answer the same question the moment someone touches it: *did we just break something that already worked?* Test coverage is the safety net that lets a team move at AI speed without quietly regressing the corners of the codebase no one remembers. The faster we move, the more that net matters. So at Nirvana, we made it a priority to solve: not by asking engineers to write more backfill tests, but by building an autonomous agent that does it for us, inside guardrails strict enough that we trust it to run unattended. This post is the full walkthrough: the architecture, how we prioritize what the bot works on, how it remembers what it has done (and why that state now lives in S3), what the cadence looks like, and the safety model that makes the whole thing sleep-at-night safe.
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