Web Reference: It's common in JavaScript for code to run asynchronously. When you have code that runs asynchronously, Jest needs to know when the code it is testing has completed, before it can move on to another test. Jest has several ways to handle this. Mar 28, 2026 · Jest makes it easy to test asynchronous functions using async/await or returning promises. The fetchD function returns a promise that resolves after 1 second with the value 'Data loaded'. The await keyword waits for the promise to resolve, and the result is checked using expect (). Sep 18, 2013 · There seems to be a common misconception in the JavaScript community that testing asynchronous code requires a different approach than testing ‘regular’ synchronous code. In this post I’ll explain why that’s not generally the case.
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