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Testing JavaScript Code

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Asynchronous code is a fundamental part of JavaScript, allowing you to perform operations like fetching data from a server, reading files, or waiting for timers without blocking the rest of your program. In JavaScript, asynchronous behavior is commonly handled using callbacks, promises, or the modern async/await syntax. Unlike synchronous code, where you get results right away, asynchronous functions might take some time to complete, so their results are not available immediately. This timing difference means you need special techniques to test asynchronous code properly: your tests must wait for the async operations to finish before making assertions, or you could end up with false positives or negatives.

test.js

test.js

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1. What is a common reason for needing special handling when testing asynchronous code?

2. Which Jest feature helps you test functions that return promises or use async/await?

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What is a common reason for needing special handling when testing asynchronous code?

Select the correct answer

question mark

Which Jest feature helps you test functions that return promises or use async/await?

Select the correct answer

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How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 4

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bookAsync Testing Basics

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Asynchronous code is a fundamental part of JavaScript, allowing you to perform operations like fetching data from a server, reading files, or waiting for timers without blocking the rest of your program. In JavaScript, asynchronous behavior is commonly handled using callbacks, promises, or the modern async/await syntax. Unlike synchronous code, where you get results right away, asynchronous functions might take some time to complete, so their results are not available immediately. This timing difference means you need special techniques to test asynchronous code properly: your tests must wait for the async operations to finish before making assertions, or you could end up with false positives or negatives.

test.js

test.js

copy

1. What is a common reason for needing special handling when testing asynchronous code?

2. Which Jest feature helps you test functions that return promises or use async/await?

question mark

What is a common reason for needing special handling when testing asynchronous code?

Select the correct answer

question mark

Which Jest feature helps you test functions that return promises or use async/await?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 4
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