Regression testing in Testing Fundamentals - Test Execution Trace

Test Overview

This test checks that a previously fixed bug does not appear again after new changes. It verifies that the login feature still works correctly after updates.

Test Code - Selenium with unittest

Testing Fundamentals

import unittest
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

class TestLoginRegression(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome()
        self.driver.get('https://example.com/login')

    def test_login_functionality(self):
        driver = self.driver
        # Wait for username field
        WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, 'username')))
        username_input = driver.find_element(By.ID, 'username')
        password_input = driver.find_element(By.ID, 'password')
        login_button = driver.find_element(By.ID, 'login-btn')

        username_input.send_keys('testuser')
        password_input.send_keys('correctpassword')
        login_button.click()

        # Wait for dashboard to load
        WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, 'dashboard')))
        dashboard = driver.find_element(By.ID, 'dashboard')

        self.assertTrue(dashboard.is_displayed(), 'Dashboard should be visible after login')

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

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

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	Test starts and opens Chrome browser	Browser opened at https://example.com/login page	-	PASS
2	Waits up to 10 seconds for username input field to appear	Login page loaded with username, password fields and login button visible	Username input field is present	PASS
3	Finds username, password inputs and login button elements	All login form elements located	-	PASS
4	Enters 'testuser' in username and 'correctpassword' in password fields	Login form filled with credentials	-	PASS
5	Clicks the login button	Login form submitted, waiting for dashboard page	-	PASS
6	Waits up to 10 seconds for dashboard element to appear	Dashboard page loaded with dashboard element visible	Dashboard element is present	PASS
7	Checks if dashboard element is displayed	Dashboard visible on screen	Assert dashboard.is_displayed() is True	PASS
8	Test ends and browser closes	Browser closed	-	PASS

Failure Scenario

Failing Condition: Dashboard element does not appear after login, indicating login failed or page did not load

Execution Trace Quiz - 3 Questions

What does the test verify after clicking the login button?

A That the dashboard page appears

B That the login button is disabled

C That the username field is cleared

D That the password is visible

Key Result

Always include checks for key page elements after a change to confirm old features still work, which is the core of regression testing.