Base page class in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Selenium base page class method?

Consider this base page class method that waits for an element to be visible and returns its text.
What will be printed when calling get_element_text() if the element is visible and contains 'Hello World'?

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

class BasePage:
    def __init__(self, driver):
        self.driver = driver

    def get_element_text(self, locator):
        element = WebDriverWait(self.driver, 10).until(
            EC.visibility_of_element_located(locator)
        )
        return element.text

# Usage example:
# base_page = BasePage(driver)
# print(base_page.get_element_text((By.ID, 'greeting')))

A "Hello World"

B "" (empty string)

C TimeoutException

D NoSuchElementException

💡 Hint

The method waits until the element is visible before getting text.

The method waits up to 10 seconds for the element to be visible. If visible, it returns the element's text, which is 'Hello World'.

❓ locator

intermediate

Which locator is best practice for a base page class method?

You want to write a base page method that clicks a button reliably. Which locator is best to use?

A By.ID, "submit"

B By.CSS_SELECTOR, "button.submit-btn"

C By.XPATH, "//button[text()='Submit']"

D By.CLASS_NAME, "btn"

💡 Hint

IDs are unique and fast to locate.

Using By.ID is best practice because IDs are unique on the page and locating by ID is faster and more reliable.

❓ assertion

advanced

Which assertion correctly verifies a page title in a base page test?

You want to assert that the page title is exactly 'Dashboard'. Which assertion is correct?

Selenium Python

def test_page_title(base_page):
    title = base_page.driver.title
    # Which assertion below is correct?

A assert 'Dashboard' in title

B assert title == 'Dashboard'

C assert title.startswith('Dashboard')

D assert title != 'Dashboard'

💡 Hint

Exact match is needed for this test.

The assertion must check that the title equals 'Dashboard' exactly, so option B is correct.

🔧 Debug

advanced

Why does this base page method raise TimeoutException?

This base page method waits for an element to be clickable but raises TimeoutException every time.
What is the likely cause?

Selenium Python

def click_element(self, locator):
    element = WebDriverWait(self.driver, 5).until(
        EC.element_to_be_clickable(locator)
    )
    element.click()

A The wait time of 5 seconds is too long

B The element is visible but disabled

C The locator is incorrect or does not match any element

D The driver is not initialized

💡 Hint

TimeoutException means the condition was never met.

TimeoutException usually means the locator did not find any clickable element within the wait time, often due to wrong locator.

❓ framework

expert

What is the main benefit of using a base page class in Selenium tests?

Choose the best explanation for why a base page class is used in Selenium test automation frameworks.

A It allows running tests in parallel without conflicts

B It automatically generates test reports after each test run

C It replaces the need for explicit waits by handling all waits internally

D It centralizes common page actions and locators to reduce code duplication and improve maintainability

💡 Hint

Think about code reuse and organization.

A base page class holds common methods and locators shared by multiple pages, reducing repeated code and making maintenance easier.

Practice

1. What is the main purpose of a BasePage class in Selenium Python testing?

easy

A. To group common web page actions and locators for reuse

B. To store test data for different test cases

C. To define the browser settings and capabilities

D. To generate test reports automatically

Solution

1. Step 1: Understand the role of BasePage

   The BasePage class is designed to hold common actions and locators shared by multiple page classes.

2. Step 2: Compare with other options

   Storing test data, browser settings, or generating reports are not responsibilities of BasePage.

3. Final Answer:

   To group common web page actions and locators for reuse -> Option A

4. Quick Check:

   BasePage groups common actions [OK]

Hint: BasePage holds shared page methods and locators [OK]

Common Mistakes:

• Confusing BasePage with test data storage
• Thinking BasePage manages browser setup
• Assuming BasePage creates reports

2. Which of the following is the correct way to define a locator tuple in a BasePage class?

easy

A. submit_button = (By.ID, 'submit')

B. submit_button = ['id', 'submit']

C. submit_button = {'id': 'submit'}

D. submit_button = By.ID('submit')

Solution

1. Step 1: Recall locator tuple syntax

   Locator tuples use the format (By.<METHOD>, 'value'), e.g., (By.ID, 'submit').

2. Step 2: Check each option

   submit_button = (By.ID, 'submit') matches the tuple format. The other options use wrong data structures or invalid syntax.

3. Final Answer:

   submit_button = (By.ID, 'submit') -> Option A

4. Quick Check:

   Locator tuple = (By.METHOD, 'value') [OK]

Hint: Locator tuples always use parentheses and By constants [OK]

Common Mistakes:

• Using lists or dicts instead of tuples for locators
• Calling By.ID as a function
• Missing parentheses around locator tuple

3. Given this BasePage method, what will page.get_title() return if the browser's current page title is "Welcome Page"?

class BasePage:
    def __init__(self, driver):
        self.driver = driver

    def get_title(self):
        return self.driver.title

page = BasePage(driver)

medium

A. An error because get_title has no return

B. self.driver

C. None

D. "Welcome Page"

Solution

1. Step 1: Understand get_title method

   The method returns self.driver.title, which is the current page title string.

2. Step 2: Check given title

   The browser's current page title is "Welcome Page", so the method returns that string.

3. Final Answer:

   "Welcome Page" -> Option D

4. Quick Check:

   get_title returns driver.title = "Welcome Page" [OK]

Hint: get_title returns driver.title string [OK]

Common Mistakes:

• Thinking it returns the driver object
• Assuming no return means None
• Confusing method with attribute

4. Identify the error in this BasePage method and how to fix it:

class BasePage:
    def __init__(self, driver):
        self.driver = driver

    def click_element(locator):
        element = self.driver.find_element(*locator)
        element.click()

medium

A. Using find_element instead of find_elements

B. Missing 'self' parameter in click_element method

C. Locator should be a string, not a tuple

D. element.click() should be element.click

Solution

1. Step 1: Check method parameters

   Instance methods must have 'self' as the first parameter. Here, click_element lacks 'self'.

2. Step 2: Understand impact

   Without 'self', calling click_element will cause a TypeError because 'self.driver' is undefined.

3. Final Answer:

   Missing 'self' parameter in click_element method -> Option B

4. Quick Check:

   Instance methods need 'self' first [OK]

Hint: Always include 'self' as first method parameter [OK]

Common Mistakes:

• Forgetting 'self' in instance methods
• Confusing find_element with find_elements
• Misunderstanding locator types
• Using method call without parentheses

5. You want to create a BasePage method is_element_visible that returns True if an element is visible and False if not, without raising exceptions. Which is the best way to implement it?

hard

A. Use driver.page_source to search for element HTML string

B. Call find_element and return True without exception handling

C. Use try-except to catch NoSuchElementException and return False if caught

D. Use find_elements and check if list length is greater than zero

Solution

1. Step 1: Understand element visibility check

   Using find_element raises NoSuchElementException if element not found, so we must handle it.

2. Step 2: Use try-except for safe check

   Try to find element and check is_displayed(). If exception occurs, return False safely.

3. Final Answer:

   Use try-except to catch NoSuchElementException and return False if caught -> Option C

4. Quick Check:

   Try-except handles missing element safely [OK]

Hint: Wrap find_element in try-except to avoid exceptions [OK]

Common Mistakes:

• Not handling exceptions causing test failure
• Assuming find_elements always returns visible elements
• Searching page_source is unreliable and slow