Developer Builds Zero-Dependency Rust Photo Server — and Finds a Silent QR Bug

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A developer built 'darkroom', a Rust-based tool that serves a browsable photo timeline over local Wi-Fi, with an entirely empty dependencies section in its Cargo.toml. To achieve this, the developer hand-wrote 14 components normally sourced from libraries, including a JPEG decoder, a DEFLATE compressor, and a QR code generator. Despite a fully passing test suite of 456 tests, the QR codes produced by the tool were visually convincing but unreadable by any real-world scanner. The bug went undetected because the tests verified internal logic rather than actual scan-ability against a physical device or reference decoder. The project highlights a core limitation of unit testing: a green suite can coexist with a completely broken real-world feature.

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