Test class using page objects in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of a Selenium test using Page Object

What will be the output of this test run if the login page loads correctly and the username field is present?

Selenium Python

from selenium.webdriver.common.by import By
from selenium.webdriver.remote.webdriver import WebDriver

class LoginPage:
    def __init__(self, driver: WebDriver):
        self.driver = driver
        self.username_input = (By.ID, 'username')

    def is_username_displayed(self):
        return self.driver.find_element(*self.username_input).is_displayed()


class TestLogin:
    def test_username_field(self, driver):
        page = LoginPage(driver)
        assert page.is_username_displayed() is True
        print('Test Passed')

A Test Passed

B AssertionError

C SyntaxError

D NoSuchElementException

💡 Hint

Think about what happens if the element is found and is visible.

If the username input is found and visible, the assertion passes and 'Test Passed' is printed.

❓ locator

intermediate

Best locator strategy in Page Object

Which locator is the best practice to use in a Page Object for a login button with id 'loginBtn'?

A By.ID, 'loginBtn'

B By.XPATH, "//button[text()='Login']"

C By.CSS_SELECTOR, 'button.login-button'

D By.CLASS_NAME, 'btn'

💡 Hint

IDs are unique and fast to locate.

Using By.ID is the fastest and most reliable locator if the element has a unique id.

❓ assertion

advanced

Correct assertion for page title in test class

Which assertion correctly verifies the page title is exactly 'Dashboard' in a Selenium test class?

Selenium Python

def test_page_title(self, driver):
    driver.get('https://example.com/dashboard')

A assert driver.title != 'Dashboard'

B assert 'Dashboard' in driver.title

C assert driver.title == 'Dashboard'

D assert driver.title is 'Dashboard'

💡 Hint

Use equality operator for exact match.

Using '==' checks exact equality. 'is' checks identity and is incorrect here.

🔧 Debug

advanced

Identify error in test class using Page Object

What error will this test raise when run?

Selenium Python

from selenium.webdriver.common.by import By

class LoginPage:
    def __init__(self, driver):
        self.driver = driver
        self.password_input = (By.ID, 'password')

    def enter_password(self, pwd):
        self.driver.find_element(self.password_input).send_keys(pwd)

class TestLogin:
    def test_password_entry(self, driver):
        page = LoginPage(driver)
        page.enter_password('secret')

A NoSuchElementException

B TypeError: find_element() takes 2 positional arguments but 1 was given

C AttributeError: 'tuple' object has no attribute 'send_keys'

D No error, test passes

💡 Hint

Check how find_element is called with tuple argument.

find_element expects two arguments: locator strategy and locator value, but a single tuple was passed.

❓ framework

expert

Test class setup and teardown with Page Object

Which test class structure correctly uses setup and teardown methods with a Page Object in pytest style?

A

import unittest
from selenium import webdriver

class TestLogin(unittest.TestCase):
    def setup(self):
        self.driver = webdriver.Chrome()
        self.page = LoginPage(self.driver)

    def teardown(self):
        self.driver.quit()

    def test_login(self):
        self.page.open()
        self.assertTrue(self.page.is_loaded())

B

import pytest
from selenium import webdriver

class TestLogin:
    def setup(self):
        self.driver = webdriver.Chrome()
        self.page = LoginPage(self.driver)

    def teardown(self):
        self.driver.quit()

    def test_login(self):
        self.page.open()
        assert self.page.is_loaded()

C

import unittest
from selenium import webdriver

class TestLogin(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome()
        self.page = LoginPage(self.driver)

    def tearDown(self):
        self.driver.quit()

    def test_login(self):
        self.page.open()
        self.assertTrue(self.page.is_loaded())

D

import pytest
from selenium import webdriver

class TestLogin:
    def setup_method(self):
        self.driver = webdriver.Chrome()
        self.page = LoginPage(self.driver)

    def teardown_method(self):
        self.driver.quit()

    def test_login(self):
        self.page.open()
        assert self.page.is_loaded()

💡 Hint

pytest uses setup_method and teardown_method for per-test setup/teardown.

In pytest, setup_method and teardown_method are the correct names for setup and teardown per test method. unittest uses setUp and tearDown.