One post tagged with "unit tests"

For decades, a "golden mantra" of product-to-test code ratio existed among engineers: 1:1. It was believed that if the volume of code a developer writes equals the volume of tests, the project is in good shape.

However, new scientific research and the rapid development of test automation tools (especially LLMs) in 2024–2025 show that this metric is outdated. Today, to ensure high quality in mature systems, test code must constitute 50% or more of the entire codebase.