Behavior-driven development (BDD) concept in Testing Fundamentals - Test Execution Trace

Test Overview

This test checks a simple login feature using Behavior-driven development (BDD). It verifies that when a user enters correct credentials, they successfully log in and see a welcome message.

Test Code - Behave with Selenium

Testing Fundamentals

from behave import given, when, then
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

@given('the user is on the login page')
def step_impl(context):
    context.driver = webdriver.Chrome()
    context.driver.get('https://example.com/login')

@when('the user enters valid username and password')
def step_impl(context):
    username_input = context.driver.find_element(By.ID, 'username')
    password_input = context.driver.find_element(By.ID, 'password')
    username_input.send_keys('validUser')
    password_input.send_keys('validPass123')
    login_button = context.driver.find_element(By.ID, 'login-btn')
    login_button.click()

@then('the user should see the welcome message')
def step_impl(context):
    WebDriverWait(context.driver, 10).until(
        EC.presence_of_element_located((By.ID, 'welcome-msg'))
    )
    welcome_text = context.driver.find_element(By.ID, 'welcome-msg').text
    assert welcome_text == 'Welcome, validUser!'
    context.driver.quit()

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts and opens Chrome browser	Browser window opens at 'https://example.com/login' showing login form with username and password fields	-	PASS
2	Find username and password input fields and enter valid credentials	Username field filled with 'validUser', password field filled with 'validPass123'	-	PASS
3	Find and click the login button	Login button clicked, page starts loading the user dashboard	-	PASS
4	Wait for welcome message element to appear	Welcome message element with id 'welcome-msg' appears on the page	Check that welcome message text equals 'Welcome, validUser!'	PASS
5	Close the browser and end test	Browser window closes	-	PASS

Failure Scenario

Failing Condition: Welcome message element does not appear or text is incorrect after login

Execution Trace Quiz - 3 Questions

What does the test verify after clicking the login button?

A That the login button is disabled

B That the welcome message with correct text appears

C That the username field is cleared

D That the password is visible

Key Result

BDD tests use simple language to describe user behavior, making tests easy to read and understand by both technical and non-technical team members.