Unexpected alert handling in Selenium Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to switch to the alert.

Selenium Java

Alert alert = driver.[1]();

Drag options to blanks, or click blank then click option'

AswitchTo().alert()

BswitchTo().alert

CswitchTo.alert()

DswitchTo().alerts()

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting parentheses after alert()

Using alert without switchTo()

In Selenium Java, to switch to an alert, you use driver.switchTo().alert() with parentheses to call the method.

2fill in blank

medium

Complete the code to accept the unexpected alert.

Selenium Java

driver.switchTo().alert().[1]();

Drag options to blanks, or click blank then click option'

Aaccept

Bdismiss

Cclose

DsendKeys

Attempts:

3 left

💡 Hint

Common Mistakes

Using dismiss() instead of accept()

Trying to close() the alert

To accept an alert (click OK), use accept() method on the alert object.

3fill in blank

hard

Fix the error in the code to get alert text.

Selenium Java

String alertText = driver.switchTo().alert().[1]();

Drag options to blanks, or click blank then click option'

Atext

Bget_text

CgetText

DgetAlertText

Attempts:

3 left

💡 Hint

Common Mistakes

Using Python style get_text

Using non-existent methods like getAlertText

The correct method to get alert text is getText() with camel case and parentheses.

4fill in blank

hard

Fill both blanks to handle alert and print its text.

Selenium Java

Alert alert = driver.[1]();
System.out.println(alert.[2]());

Drag options to blanks, or click blank then click option'

AswitchTo().alert()

Baccept

CgetText

Ddismiss

Attempts:

3 left

💡 Hint

Common Mistakes

Using accept() instead of getText() when printing

Not switching to alert before accessing it

First, switch to the alert with switchTo().alert(), then get its text with getText().

5fill in blank

hard

Fill all three blanks to handle unexpected alert by getting text, accepting it, and printing the message.

Selenium Java

Alert alert = driver.[1]();
String message = alert.[2]();
alert.[3]();
System.out.println(message);

Drag options to blanks, or click blank then click option'

AswitchTo().alert()

BgetText

Caccept

Ddismiss

Attempts:

3 left

💡 Hint

Common Mistakes

Calling accept() before getText() causing lost message

Using dismiss() instead of accept()

Switch to alert, get its text, accept the alert to close it, then print the message.

Practice

1. What is the main reason to handle unexpected alerts in Selenium tests?

easy

A. To prevent tests from stopping abruptly due to unhandled pop-ups

B. To improve the speed of test execution

C. To change the browser window size automatically

D. To log user actions during the test

Solution

1. Step 1: Understand unexpected alerts impact

   Unexpected alerts block the browser and stop test execution if not handled.

2. Step 2: Purpose of handling alerts

   Handling alerts allows the test to continue smoothly without interruption.

3. Final Answer:

   To prevent tests from stopping abruptly due to unhandled pop-ups -> Option A

4. Quick Check:

   Unexpected alerts stop tests = Handle alerts [OK]

Hint: Handle alerts to keep tests running without interruption [OK]

Common Mistakes:

• Thinking alerts only slow tests, not stop them
• Confusing alert handling with browser resizing
• Assuming alerts are for logging only

2. Which Selenium Java code snippet correctly switches to an alert and accepts it?

easy

A. driver.switchTo().alert().dismiss();

B. driver.alert().switchTo().accept();

C. driver.switchTo().alert().accept();

D. driver.switchTo().alert().sendKeys();

Solution

1. Step 1: Identify correct alert switching syntax

   The correct method to switch to alert is driver.switchTo().alert()

2. Step 2: Accept the alert

   Calling accept() on the alert confirms it and closes the pop-up.

3. Final Answer:

   driver.switchTo().alert().accept(); -> Option C

4. Quick Check:

   Switch to alert then accept = driver.switchTo().alert().accept() [OK]

Hint: Use driver.switchTo().alert().accept() to accept alerts [OK]

Common Mistakes:

• Reversing switchTo() and alert() calls
• Using dismiss() instead of accept() when accept is needed
• Calling sendKeys() without parameters

3. What will happen if the following code runs when an unexpected alert is present?

driver.findElement(By.id("submit")).click();
driver.switchTo().alert().dismiss();
driver.findElement(By.id("next")).click();

medium

A. The alert will be accepted instead of dismissed

B. No alert handling occurs and test throws NoAlertPresentException

C. The test will fail at clicking submit due to alert presence

D. The alert will be dismissed and the next button clicked successfully

Solution

1. Step 1: Click triggers alert

   Clicking submit may cause an alert to appear unexpectedly.

2. Step 2: Alert is dismissed explicitly

   driver.switchTo().alert().dismiss() closes the alert, allowing further actions.

3. Step 3: Next element interaction

   After dismissing alert, clicking next proceeds without interruption.

4. Final Answer:

   The alert will be dismissed and the next button clicked successfully -> Option D

5. Quick Check:

   Dismiss alert then continue = success [OK]

Hint: Dismiss alert before next action to avoid test failure [OK]

Common Mistakes:

• Assuming alert auto-dismisses without code
• Expecting accept() instead of dismiss() here
• Ignoring NoAlertPresentException possibility

4. Identify the error in this code snippet handling unexpected alerts:

try {
  driver.findElement(By.id("save")).click();
} catch (NoAlertPresentException e) {
  driver.switchTo().alert().accept();
}

medium

A. NoAlertPresentException should be caught after alert handling

B. Alert handling code is inside catch for wrong exception

C. Accept() should be replaced with dismiss()

D. Try block should include alert handling, not catch

Solution

1. Step 1: Understand exception usage

   NoAlertPresentException occurs when alert is not present but code tries to switch to alert.

2. Step 2: Analyze catch block logic

   Alert handling code is wrongly placed inside catch for NoAlertPresentException, which means alert is not present.

3. Step 3: Correct approach

   Alert handling should be in try block or catch should handle different exception like UnhandledAlertException.

4. Final Answer:

   Alert handling code is inside catch for wrong exception -> Option B

5. Quick Check:

   Catch wrong exception for alert handling = error [OK]

Hint: Catch UnhandledAlertException, not NoAlertPresentException for alerts [OK]

Common Mistakes:

• Catching NoAlertPresentException to handle alert
• Placing alert.accept() inside catch for missing alert
• Confusing accept() and dismiss() usage

5. You want to write a Selenium Java method that safely clicks a button even if an unexpected alert appears. Which code snippet correctly handles this scenario?

hard

A. try {
driver.findElement(By.id("btn")).click();
} catch (UnhandledAlertException e) {
driver.switchTo().alert().accept();
driver.findElement(By.id("btn")).click();
}

B. driver.findElement(By.id("btn")).click();
driver.switchTo().alert().accept();

C. driver.switchTo().alert().accept();
driver.findElement(By.id("btn")).click();

D. try {
driver.switchTo().alert().accept();
} catch (NoAlertPresentException e) {
driver.findElement(By.id("btn")).click();
}

Solution

1. Step 1: Understand unexpected alert during click

   Clicking the button may cause an unexpected alert, throwing UnhandledAlertException.

2. Step 2: Use try-catch to handle alert and retry click

   Catch UnhandledAlertException, accept alert, then retry clicking the button to ensure action completes.

3. Step 3: Verify other options

   driver.findElement(By.id("btn")).click(); driver.switchTo().alert().accept(); and C do not handle exceptions; try { driver.switchTo().alert().accept(); } catch (NoAlertPresentException e) { driver.findElement(By.id("btn")).click(); } tries alert first which may not exist before click.

4. Final Answer:

   try { driver.findElement(By.id("btn")).click(); } catch (UnhandledAlertException e) { driver.switchTo().alert().accept(); driver.findElement(By.id("btn")).click(); } -> Option A

5. Quick Check:

   Catch alert exception, accept, retry click = safe handling [OK]

Hint: Catch alert exception, accept alert, then retry action [OK]

Common Mistakes:

• Not retrying click after alert acceptance
• Handling alert before click without exception
• Catching wrong exception types