Mocking in Rust: Mockall and alternatives - LogRocket Blog
Briefly

Testing is an integral part of software engineering.For beginners, writing a test case makes sure that your code does exactly what you expect it to do.Every programming language has various frameworks that help you test your code.Small pet projects can get away with not having testing in place, but as an application scales, you run into the risk of hitting a wall where you become paranoid after you push a new feature to production.
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