Async script execution in Selenium Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is async script execution in Selenium?

Async script execution allows Selenium to run JavaScript code that executes asynchronously in the browser, letting the script wait for a callback or timeout before continuing.

beginner

How do you set the timeout for async script execution in Selenium Java?

Use driver.manage().timeouts().setScriptTimeout(Duration.ofSeconds(seconds)) to set how long Selenium waits for the async script to finish.

beginner

Which Selenium method runs asynchronous JavaScript?

The method executeAsyncScript() runs JavaScript asynchronously and waits for a callback to signal completion.

intermediate

What must your JavaScript code do to signal completion in async script execution?

Your JavaScript must call the provided callback function to tell Selenium the script finished, otherwise it will timeout.

intermediate

Why use async script execution instead of normal script execution?

Async execution is useful for waiting on events or timers in the browser without blocking, making tests more reliable for dynamic pages.

Which Selenium method is used to execute asynchronous JavaScript?

A executeAsyncScript()

B executeScript()

C runAsyncScript()

D startAsyncScript()

executeAsyncScript() runs JavaScript asynchronously and waits for a callback.

How do you tell Selenium that your async JavaScript has finished?

A By throwing an exception

B By returning a value from the script

C By setting a global variable

D By calling the callback function passed to the script

The async script must call the callback function to signal completion.

What happens if the async script does not call the callback in time?

A The test passes immediately

B Selenium throws a timeout exception

C The browser reloads

D The script runs synchronously instead

If the callback is not called before the timeout, Selenium throws a timeout exception.

How do you set the timeout for async script execution in Selenium Java?

A driver.setScriptTimeout(10)

B driver.setAsyncTimeout(10)

C driver.manage().timeouts().setScriptTimeout(Duration.ofSeconds(10))

D driver.manage().timeouts().setPageLoadTimeout(10)

setScriptTimeout sets how long Selenium waits for async scripts to finish.

Why is async script execution useful in testing?

A It allows waiting for browser events without blocking the test

B It speeds up test execution by skipping waits

C It disables JavaScript in the browser

D It runs scripts on the server side

Async execution lets tests wait for events or timers in the browser without blocking.

Explain how async script execution works in Selenium and why the callback function is important.

Think about how Selenium knows when your script is done.

Describe how to set up and use async script execution in Selenium Java, including timeout settings.

Focus on the Java code and JavaScript interaction.