Expected conditions in Selenium Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are Expected Conditions in Selenium?

Expected Conditions are predefined rules or states that Selenium waits for before continuing test execution, like waiting for an element to be visible or clickable.

beginner

Why do we use Expected Conditions instead of fixed waits?

Expected Conditions wait only as long as needed for a condition to be true, making tests faster and more reliable than fixed waits which pause for a set time regardless of readiness.

beginner

Name three common Expected Conditions in Selenium.

1. element_to_be_clickable
2. visibility_of_element_located
3. presence_of_element_located

intermediate

How do you use Expected Conditions with WebDriverWait in Selenium Python?

You create a WebDriverWait object with a timeout, then call its until() method with an Expected Condition to wait until that condition is met or timeout occurs.

intermediate

What happens if an Expected Condition is not met within the timeout?

Selenium throws a TimeoutException, indicating the condition was not fulfilled in time, which usually causes the test to fail.

Which Selenium class is used to wait for Expected Conditions?

A WebDriverSleep

B WebDriverWait

C ExpectedWait

D WaitCondition

WebDriverWait is the Selenium class designed to wait for Expected Conditions.

What does the Expected Condition 'element_to_be_clickable' check for?

A Element is hidden

B Element is present in the DOM

C Element is visible and enabled so it can be clicked

D Element has a specific text

'element_to_be_clickable' waits until the element is visible and enabled for clicking.

What exception is raised if an Expected Condition times out?

A NoSuchElementException

B ElementNotVisibleException

C StaleElementReferenceException

D TimeoutException

TimeoutException is raised when the wait exceeds the specified timeout without the condition being met.

Why is using Expected Conditions better than using time.sleep()?

A Expected Conditions wait only as long as needed, making tests faster and more reliable

B time.sleep() is faster

C Expected Conditions ignore element states

D time.sleep() waits for conditions automatically

Expected Conditions wait dynamically until the condition is met, unlike time.sleep() which waits a fixed time.

Which Expected Condition waits for an element to be present in the DOM but not necessarily visible?

A presence_of_element_located

B invisibility_of_element

C element_to_be_clickable

D visibility_of_element_located

'presence_of_element_located' waits for the element to exist in the DOM regardless of visibility.

Explain what Expected Conditions are and why they are important in Selenium testing.

Think about waiting smartly for page elements.

Describe how to use WebDriverWait with an Expected Condition in Selenium Python.

Focus on the wait and condition interaction.

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