Bun's test runs recorded more than one million expect() calls per reported platform during the Rust migration.

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"Bun’s test runs recorded more than one million expect() calls per reported platform during the Rust migration."

Sumner's CI statistics report approximately 1.39 million expectation calls on Debian, 1.26 million on macOS and 1.01 million on Windows. These figures show the scale of automated testing used during the migration without conflating repeated platform executions with distinct test assertions.

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Source title Rewriting Bun in Rust

Source authors Jarred Sumner

Source year 2026

Confidence high

Importance mid