Test an async function
Test async functions across resolution, rejection, timeout, and concurrent call scenarios. Shows how to avoid false positives from unhandled rejections.
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Write tests for the following async [Language] function: [Paste code]. Use [Testing framework] and cover: a successful resolution with the expected return value, a rejected promise with the expected error type and message, behaviour when a timeout is reached, and concurrent invocations to check for shared state issues. Show the correct patterns for awaiting assertions and preventing false positives from unhandled promise rejections.
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