Base page class in Selenium Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Base Page Class in Selenium testing?

A Base Page Class is a common parent class that holds shared methods and properties for all page classes. It helps avoid repeating code and makes tests easier to maintain.

beginner

Why do we use locators in the Base Page Class?

Locators find elements on a web page. In the Base Page Class, we store common locators or methods to find elements so all pages can reuse them safely and clearly.

intermediate

Example method in Base Page Class: How to wait for an element to be visible?

Use WebDriverWait with expected_conditions. For example, a method like wait_for_element(locator) waits until the element is visible before continuing.

intermediate

What is the benefit of having a Base Page Class when the website changes?

When locators or common actions change, you update only the Base Page Class. This fixes all page classes that use it, saving time and reducing errors.

beginner

How does the Base Page Class improve test readability?

It groups common actions like clicking or typing into named methods. Tests read like simple instructions, making them easier to understand and follow.

What is the main purpose of a Base Page Class in Selenium?

A To write test assertions

B To run tests faster

C To replace the WebDriver

D To store common methods and locators for all pages

The Base Page Class holds shared methods and locators to avoid repeating code across page classes.

Which Selenium feature is commonly used in Base Page Class to wait for elements?

A WebDriverWait with expected_conditions

B time.sleep()

C JavaScript alerts

D Browser cookies

WebDriverWait with expected_conditions waits smartly for elements to appear, improving test reliability.

Where should you update locators if the website changes?

A In the browser settings

B In each test script

C In the Base Page Class

D In the test report

Updating locators in the Base Page Class updates all page classes that use them, making maintenance easier.

Which of these is NOT a benefit of using a Base Page Class?

A Reduces code duplication

B Automatically fixes broken tests

C Improves test readability

D Simplifies maintenance

The Base Page Class helps organize code but does not automatically fix broken tests.

What should a Base Page Class NOT contain?

A Test assertions

B Common page actions like click or type

C Locator definitions

D Wait methods for elements

Assertions belong in test scripts, not in the Base Page Class which focuses on page actions and locators.

Explain what a Base Page Class is and why it is useful in Selenium testing.

Think about how to avoid repeating code for every page.

Describe how you would implement a method in the Base Page Class to wait for an element to be visible.

Focus on waiting smartly instead of using fixed delays.

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