Alert accept and dismiss in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output after accepting the alert?

Consider the following Selenium Java code snippet that handles a JavaScript alert. What will be the printed output after the alert is accepted?

Selenium Java

WebDriver driver = new ChromeDriver();
driver.get("https://example.com/alert");
Alert alert = driver.switchTo().alert();
String alertText = alert.getText();
alert.accept();
System.out.println(alertText);

A Prints null

B No output is printed because accept() closes the alert silently

C Throws NoAlertPresentException

D The text inside the alert box is printed

💡 Hint

Remember that getText() reads the alert message before accepting it.

The getText() method retrieves the alert message before the alert is accepted. So the printed output is the alert's text.

❓ assertion

intermediate

Which assertion correctly verifies alert dismissal?

You want to verify that after dismissing an alert, a label on the page shows "Cancelled". Which assertion is correct?

Selenium Java

Alert alert = driver.switchTo().alert();
alert.dismiss();
String labelText = driver.findElement(By.id("resultLabel")).getText();

A assertEquals("Cancelled", labelText);

B assertTrue(labelText.contains("Cancelled"));

C assertFalse(labelText.equals("Cancelled"));

D assertNull(labelText);

💡 Hint

Check exact match of the label text after dismissing the alert.

The label should exactly show "Cancelled" after dismissing the alert, so assertEquals is the best choice.

🔧 Debug

advanced

Why does this alert accept code throw NoAlertPresentException?

Analyze the code below. Why does it throw NoAlertPresentException at runtime?

Selenium Java

driver.get("https://example.com/noalert");
Alert alert = driver.switchTo().alert();
alert.accept();

A No alert is present on the page when switchTo().alert() is called

B The alert is already accepted before calling accept()

C The alert text is empty

D The driver instance is null

💡 Hint

Check if the page actually shows an alert before switching.

NoAlertPresentException occurs because the code tries to switch to an alert that does not exist on the page.

❓ framework

advanced

Which Selenium wait strategy best handles alerts appearing asynchronously?

You want to wait for an alert to appear before accepting it. Which Selenium wait approach is best?

A Use implicit wait set to 10 seconds

B Use Thread.sleep(5000) before switching to alert

C Use WebDriverWait with ExpectedConditions.alertIsPresent()

D Use FluentWait ignoring NoAlertPresentException without condition

💡 Hint

Look for a wait condition specifically for alerts.

WebDriverWait with ExpectedConditions.alertIsPresent() waits efficiently for alert presence before switching.

🧠 Conceptual

expert

What happens if you call dismiss() on a prompt alert without sending input?

Consider a JavaScript prompt alert that asks for user input. What is the expected behavior if you call dismiss() without sending any text?

A The prompt throws an exception because input is required

B The prompt is closed and the input value is null or empty

C The prompt accepts with default text automatically

D The prompt remains open until input is sent

💡 Hint

Dismiss means canceling the prompt without input.

Calling dismiss() on a prompt closes it and returns null or empty input, simulating user cancel action.