ci: shard test suite across 3 parallel runners#251
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brendanjryan merged 1 commit intomainfrom Mar 27, 2026
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Use Vitest's --shard flag with a GitHub Actions matrix to split the ~67 test files across 3 runners. Vitest automatically balances file distribution — no manual maintenance needed. This should reduce the Test Runtime wall clock from ~2.5 min to ~50s at the cost of 3x compute (3 parallel runners).
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Splits the Test Runtime job into 3 parallel shards using Vitest's
--shardflag and a GitHub Actions matrix strategy.