Go 1.25 Testing/Synctest Package: Simplifying Asynchronous Code Testing
By
ingve
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Summary
The article discusses the testing/synctest package in Go 1.25, which has graduated from experimental to general availability. It explains the difference between synchronous and asynchronous functions, with synchronous functions executing immediately upon call and returning, while asynchronous functions return immediately but continue executing in the background. The content is based on a GopherCon Europe 2025 talk and focuses on simplifying testing for concurrent, asynchronous code in Go programming.
Key quotes
· 5 pulledIn Go 1.24, we introduced the testing/synctest package as an experimental package.
This package can significantly simplify writing tests for concurrent, asynchronous code.
In Go 1.25, the testing/synctest package has graduated from experiment to general availability.
What is an asynchronous function? A synchronous function is pretty simple. You call it, it does something, and it returns.
An asynchronous function is different. You call it, it returns, and then it does something.
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