Parameterized tests in Selenium Python - Test Execution Trace

Test Overview

This test opens a simple login page and tries multiple username and password combinations. It verifies if the login button is enabled for each set of inputs.

Test Code - unittest

Selenium Python

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 TestLoginParameterized(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.driver = webdriver.Chrome()
        cls.driver.get('https://example.com/login')

    @classmethod
    def tearDownClass(cls):
        cls.driver.quit()

    def test_login_button_enabled(self):
        test_data = [
            ("user1", "pass1"),
            ("user2", "pass2"),
            ("", "pass3"),
            ("user4", "")
        ]
        for username, password in test_data:
            username_field = WebDriverWait(self.driver, 10).until(
                EC.presence_of_element_located((By.ID, "username"))
            )
            password_field = self.driver.find_element(By.ID, "password")
            login_button = self.driver.find_element(By.ID, "loginBtn")

            username_field.clear()
            username_field.send_keys(username)
            password_field.clear()
            password_field.send_keys(password)

            # Check if login button is enabled
            is_enabled = login_button.is_enabled()

            # Assert login button is enabled only if both fields are non-empty
            expected = bool(username and password)
            self.assertEqual(is_enabled, expected, f"Failed for username='{username}' and password='{password}'")

Execution Trace - 11 Steps

Step	Action	System State	Assertion	Result
1	Test starts and Chrome browser opens	Browser opened at https://example.com/login showing login form with username, password fields and login button	-	PASS
2	Find username, password fields and login button elements	Elements located on the page	-	PASS
3	Clear username and password fields, enter 'user1' and 'pass1'	Username field contains 'user1', password field contains 'pass1'	-	PASS
4	Check if login button is enabled	Login button is enabled because both fields are filled	Assert login button enabled is True	PASS
5	Clear fields, enter 'user2' and 'pass2'	Username field contains 'user2', password field contains 'pass2'	-	PASS
6	Check if login button is enabled	Login button is enabled	Assert login button enabled is True	PASS
7	Clear fields, enter empty username '' and password 'pass3'	Username field empty, password field contains 'pass3'	-	PASS
8	Check if login button is enabled	Login button is disabled because username is empty	Assert login button enabled is False	PASS
9	Clear fields, enter username 'user4' and empty password ''	Username field contains 'user4', password field empty	-	PASS
10	Check if login button is enabled	Login button is disabled because password is empty	Assert login button enabled is False	PASS
11	Test ends and browser closes	Browser closed	-	PASS

Failure Scenario

Failing Condition: Login button enabled state does not match expected when username or password is empty

Execution Trace Quiz - 3 Questions

What does the test verify for each username and password pair?

A If the username field accepts numbers only

B If the login button is always disabled

C If the login button is enabled only when both fields are filled

D If the password field is hidden

Key Result

Parameterized tests help check multiple input cases in one test, making testing efficient and thorough.