Web Reference: Jun 22, 2025 · Discover troubleshooting tips for common Jest assertion errors. Improve your testing skills and enhance application reliability with practical solutions and insights. Since aThingThatReturnsAPromise() returns a promise, you can make use of the asynchronous testing features of Jest. Jest will wait for your promise to resolve and then you can make your assertions. 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.
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