Base page class in Selenium Python - Test Execution Trace

Test Overview

This test opens a web page using a base page class, finds a button by its ID, clicks it, and verifies the page title changes as expected.

Test Code - Selenium

Selenium Python

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

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

    def find_element(self, locator):
        return WebDriverWait(self.driver, 10).until(EC.presence_of_element_located(locator))

    def click(self, locator):
        element = self.find_element(locator)
        element.click()

class TestHomePage(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome()
        self.base_page = BasePage(self.driver)

    def test_click_button_changes_title(self):
        self.driver.get("https://example.com")
        button_locator = (By.ID, "start-button")
        self.base_page.click(button_locator)
        WebDriverWait(self.driver, 10).until(EC.title_is("Started Page"))
        self.assertEqual(self.driver.title, "Started Page")

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

if __name__ == '__main__':
    unittest.main()

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts and WebDriver Chrome instance is created	Browser window opens, ready to navigate	-	PASS
2	Browser navigates to https://example.com	Page loads with a button having ID 'start-button'	-	PASS
3	BasePage finds element with ID 'start-button' using WebDriverWait	Button element is present and visible	Element presence verified by WebDriverWait	PASS
4	BasePage clicks the 'start-button'	Button is clicked, page starts navigation or changes	-	PASS
5	Wait until page title changes to 'Started Page'	Page title updates to 'Started Page'	Title is exactly 'Started Page'	PASS
6	Assert page title equals 'Started Page'	Page title is 'Started Page'	assertEqual passes confirming title	PASS
7	Test ends and browser closes	Browser window closes	-	PASS

Failure Scenario

Failing Condition: Button with ID 'start-button' is not found on the page

Execution Trace Quiz - 3 Questions

What does the BasePage class method 'find_element' do?

A Waits up to 10 seconds for an element to be present and returns it

B Clicks on an element immediately without waiting

C Navigates the browser to a URL

D Closes the browser window

Key Result

Using a base page class with reusable methods like 'find_element' and 'click' helps keep test code clean and easy to maintain.