Reading test data from JSON in Selenium Python - Test Execution Trace

Test Overview

This test reads user login data from a JSON file and verifies successful login on a web page.

Test Code - Selenium

Selenium Python

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

    def test_login(self):
        with open('testdata.json', 'r') as file:
            data = json.load(file)
        username = data['username']
        password = data['password']

        driver = self.driver
        WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, 'username')))
        driver.find_element(By.ID, 'username').send_keys(username)
        driver.find_element(By.ID, 'password').send_keys(password)
        driver.find_element(By.ID, 'login-btn').click()

        WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, 'welcome-msg')))
        welcome_text = driver.find_element(By.ID, 'welcome-msg').text
        self.assertIn('Welcome', welcome_text)

    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 Chrome browser opens	Browser window opens at https://example.com/login page	-	PASS
2	Reads username and password from testdata.json file	JSON file loaded with keys 'username' and 'password'	-	PASS
3	Waits until username input field is present	Username input field visible on login page	Presence of element located by ID 'username'	PASS
4	Enters username and password into input fields	Username and password fields filled with test data	-	PASS
5	Clicks the login button	Login button clicked, page starts loading	-	PASS
6	Waits until welcome message element is present	Welcome message element visible on page	Presence of element located by ID 'welcome-msg'	PASS
7	Checks that welcome message contains 'Welcome'	Welcome message text retrieved	Assert 'Welcome' in welcome message text	PASS
8	Test ends and browser closes	Browser window closed	-	PASS

Failure Scenario

Failing Condition: The JSON file is missing or malformed, or the login fails due to incorrect credentials

Execution Trace Quiz - 3 Questions

At which step does the test read the login data from the JSON file?

A Step 6

B Step 4

C Step 2

D Step 1

Key Result

Reading test data from external JSON files helps separate test logic from data, making tests easier to maintain and reuse.