Expected conditions in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of waiting for element visibility

What will be the output of this Selenium Python code snippet when the element with id 'submit-btn' becomes visible within 10 seconds?

Selenium Python

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

# Assume driver is a valid WebDriver instance
wait = WebDriverWait(driver, 10)
element = wait.until(EC.visibility_of_element_located((By.ID, 'submit-btn')))
print(element.tag_name)

A Prints the tag name of the element, e.g., 'button'

B Raises TimeoutException immediately

C Prints None

D Raises NoSuchElementException

💡 Hint

Think about what visibility_of_element_located returns when the element appears.

The wait.until with visibility_of_element_located returns the WebElement once it is visible. Printing element.tag_name outputs the tag name, such as 'button'.

❓ assertion

intermediate

Correct assertion for element invisibility

Which assertion correctly verifies that an element with class name 'loading-spinner' is no longer visible using Selenium's expected conditions?

Selenium Python

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

wait = WebDriverWait(driver, 15)

# Which assertion below is correct?

A assert wait.until(EC.presence_of_element_located((By.CLASS_NAME, 'loading-spinner')))

B assert wait.until(EC.visibility_of_element_located((By.CLASS_NAME, 'loading-spinner')))

C assert wait.until(EC.element_to_be_clickable((By.CLASS_NAME, 'loading-spinner')))

D assert wait.until(EC.invisibility_of_element_located((By.CLASS_NAME, 'loading-spinner')))

💡 Hint

Look for the condition that waits for the element to disappear or become invisible.

invisibility_of_element_located waits until the element is either not present or not visible. This is the correct way to assert invisibility.

🔧 Debug

advanced

Identify the error in expected condition usage

What error will this Selenium Python code raise when executed?

Selenium Python

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

wait = WebDriverWait(driver, 5)
# Incorrect usage of expected condition
wait.until(EC.element_to_be_clickable(By.ID, 'login'))

A TypeError because expected_conditions expect a tuple locator, not separate arguments

B TimeoutException because element never becomes clickable

C NoSuchElementException because element is not found

D SyntaxError due to missing parentheses

💡 Hint

Check how locators are passed to expected conditions.

expected_conditions functions require a single locator tuple like (By.ID, 'login'). Passing By.ID and 'login' as separate arguments causes a TypeError.

🧠 Conceptual

advanced

Understanding expected condition behavior

Which statement best describes the behavior of the expected condition 'presence_of_element_located' in Selenium?

A It waits until the element is invisible or removed from the DOM

B It waits until the element is present in the DOM, regardless of visibility

C It waits until the element's text matches a given string

D It waits until the element is visible and enabled for clicking

💡 Hint

Think about presence vs visibility.

presence_of_element_located waits for the element to exist in the page's HTML structure (DOM), but does not require it to be visible.

❓ framework

expert

Best practice for waiting for multiple conditions

You want to wait until either an element with id 'success-msg' is visible or an element with id 'error-msg' is visible, whichever appears first. Which Selenium Python code snippet correctly implements this using expected conditions?

Selenium Python

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

wait = WebDriverWait(driver, 20)

# Choose the correct code:

A wait.until(EC.or_(EC.visibility_of_element_located((By.ID, 'success-msg')), EC.visibility_of_element_located((By.ID, 'error-msg'))))

B wait.until(EC.visibility_of_element_located((By.ID, 'success-msg')) or EC.visibility_of_element_located((By.ID, 'error-msg')))

C wait.until(EC.any_of(EC.visibility_of_element_located((By.ID, 'success-msg')), EC.visibility_of_element_located((By.ID, 'error-msg'))))

D wait.until(EC.visibility_of_element_located((By.ID, 'success-msg')) and EC.visibility_of_element_located((By.ID, 'error-msg')))

💡 Hint

Look for the expected condition that waits for any one of multiple conditions.

EC.any_of waits until any one of the given expected conditions is true. EC.or_ does not exist. Using Python 'or' or 'and' operators directly will not work as expected.

Practice

1. What is the main purpose of using ExpectedConditions in Selenium WebDriver?

easy

A. To wait for certain conditions before interacting with elements

B. To speed up the test execution by skipping waits

C. To generate random test data automatically

D. To take screenshots during test execution

Solution

1. Step 1: Understand ExpectedConditions role

   ExpectedConditions help Selenium wait for specific states like element visibility or clickability before proceeding.

2. Step 2: Identify the main purpose

   This waiting avoids errors caused by trying to interact with elements not yet ready on the page.

3. Final Answer:

   To wait for certain conditions before interacting with elements -> Option A

4. Quick Check:

   ExpectedConditions = Wait for conditions [OK]

Hint: ExpectedConditions = smart waits before actions [OK]

Common Mistakes:

• Thinking ExpectedConditions speed up tests by skipping waits
• Confusing ExpectedConditions with data generation
• Assuming ExpectedConditions take screenshots

2. Which of the following is the correct syntax to wait until an element located by ID 'submit' is clickable using Selenium's ExpectedConditions in Python?

easy

A. WebDriverWait(driver, 10).until(EC.visibility_of_element_located('submit'))

B. WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, 'submit')))

C. WebDriverWait(driver, 10).until(EC.element_to_be_clickable('submit'))

D. WebDriverWait(driver, 10).until(EC.presence_of_element_located(By.ID, 'submit'))

Solution

1. Step 1: Check correct ExpectedCondition usage

   element_to_be_clickable requires a locator tuple like (By.ID, 'submit').

2. Step 2: Verify syntax correctness

   WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, 'submit'))) correctly uses a tuple inside the condition and waits properly.

3. Final Answer:

   WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, 'submit'))) -> Option B

4. Quick Check:

   Use tuple locator with element_to_be_clickable [OK]

Hint: Use (By.ID, 'id') tuple inside ExpectedConditions [OK]

Common Mistakes:

• Passing string instead of locator tuple
• Using visibility_of_element_located instead of clickable
• Missing parentheses around locator tuple

3. What will be the output of the following code snippet if the element with ID 'login' becomes visible after 5 seconds?

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

wait = WebDriverWait(driver, 10)
element = wait.until(EC.visibility_of_element_located((By.ID, 'login')))
print(element.is_displayed())

medium

A. TimeoutException

B. False

C. True

D. NoSuchElementException

Solution

1. Step 1: Analyze wait duration and element visibility

   The wait is 10 seconds, and the element appears after 5 seconds, so wait.until succeeds.

2. Step 2: Understand is_displayed() output

   Since the element is visible, element.is_displayed() returns True, which is printed.

3. Final Answer:

   True -> Option C

4. Quick Check:

   Element visible within wait = True output [OK]

Hint: If element appears before timeout, is_displayed() is True [OK]

Common Mistakes:

• Expecting TimeoutException though element appears in time
• Confusing is_displayed() with presence only
• Assuming False if element appears late but within wait

4. Identify the error in the following code that waits for an element with class name 'btn' to be clickable:

wait = WebDriverWait(driver, 5)
wait.until(EC.element_to_be_clickable(By.CLASS_NAME, 'btn'))

medium

A. Timeout value too low

B. Incorrect import of WebDriverWait

C. Using CLASS_NAME instead of CSS_SELECTOR

D. Missing tuple around locator in element_to_be_clickable

Solution

1. Step 1: Check element_to_be_clickable parameter

   It requires a single locator tuple like (By.CLASS_NAME, 'btn'), not two separate arguments.

2. Step 2: Identify syntax error

   Code passes two arguments instead of one tuple, causing a TypeError.

3. Final Answer:

   Missing tuple around locator in element_to_be_clickable -> Option D

4. Quick Check:

   Locator must be a tuple inside ExpectedConditions [OK]

Hint: Always wrap locator in a tuple for ExpectedConditions [OK]

Common Mistakes:

• Passing locator arguments separately instead of tuple
• Assuming timeout value causes error here
• Confusing locator types (CLASS_NAME vs CSS_SELECTOR)

5. You want to wait until the URL contains the word 'dashboard' before proceeding. Which code snippet correctly uses ExpectedConditions to achieve this in Python Selenium?

hard

A. WebDriverWait(driver, 15).until(EC.url_contains('dashboard'))

B. WebDriverWait(driver, 15).until(EC.url_to_be('dashboard'))

C. WebDriverWait(driver, 15).until(EC.url_matches('dashboard'))

D. WebDriverWait(driver, 15).until(EC.url_is('dashboard'))

Solution

1. Step 1: Identify correct ExpectedCondition for URL substring

   EC.url_contains waits until the URL contains the given substring.

2. Step 2: Verify other options

   url_matches requires a regex pattern to match the entire URL, url_to_be checks for exact URL equality, and url_is is not a valid ExpectedCondition.

3. Final Answer:

   WebDriverWait(driver, 15).until(EC.url_contains('dashboard')) -> Option A

4. Quick Check:

   Use url_contains for substring in URL [OK]

Hint: Use EC.url_contains for partial URL waits [OK]

Common Mistakes:

• Using non-existent ExpectedConditions like url_is
• Confusing url_contains with exact match conditions like url_to_be
• Using url_matches without proper regex for substring