Software Testing Tutorial

Last Updated : 31 May, 2025

Software testing is an important part of the software development lifecycle that involves verifying and validating whether a software application works as expected. It ensures reliable, correct, secure, and high-performing software across web, mobile applications, cloud, and CI/CD pipelines in DevOps.

Need of Software Testing:

Detects bugs before release.
Ensures software meets requirements.
Improves product quality and reliability.
Reduces cost of fixing issues later.
Validates performance, security, and usability.

1. Software Testing Basics

Software testing is the backbone of quality software. This section covers essentials like the Software Development Lifecycle (SDLC), Software Testing Lifecycle (STLC), testing levels, and methods, including functional testing, verification, and Agile testing. It explains what testing is and its real-world applications, perfect for beginners and a foundation for advanced topics like automation and cloud testing.

Testing Levels

Before we go deep into testing, it’s important to understand the different testing levels involved. These stages work together to make sure your software runs smoothly and meets the expected standards.

Testing Types

Testing comes in different types, and each type focuses on checking a specific part of how your software performs. Here are the main types of software testing:

Verification Vs. Validation

Verification and Validation are two key parts of software testing. Together, they help make sure the software you deliver is both built correctly and meets user needs.

Verification vs. Validation: Key Concepts for Testers

Testing Methodologies

Testing methodologies show us how testing fits into the software development process. They help teams deliver better software more quickly and reliably.

Test Planning and Test Cases

Test planning sets the goals, scope, resources, and timelines for testing. Test cases are step-by-step guides that outline what to test, how to test it, and what results to expect.

2. Test Case Design and Execution

Good test case design and execution help find bugs early and make sure the software works as expected. This section introduces tools like TestRail that let you create and run test cases smoothly, whether you’re testing manually or automating your workflow.

Test Case Management Tools

These tools helps to organize and track all your test cases, making it simple to manage testing and work smoothly with your team.

TestRail
Other Test Management Tools

Test Design Techniques

Learn how to design test cases that find more bugs by focusing on edge cases, grouping similar inputs, and clearly mapping complex logic.

Defect Reporting

Use defect tracking tools to log bugs with all the essential details, clear steps to reproduce, severity level, and screenshots to help fix issues quickly.

Test Execution

Manual testing works best for exploring new features and finding unexpected issues, while automation handles repetitive tests to save time and ensure consistency.

Manual Testing vs. Automation Testing

3. Test Management and Reporting

Good test management keeps testing organized, and clear reporting shows how well the software works. This section covers creating test plans, setting up test environments, and using reporting tools like Allure to help teams work smoothly and share results effectively.

4. Manual Testing

Manual testing is great for exploring apps, checking how easy they are to use, and doing quick checks without set plans. This section covers main types like black-box and usability testing, plus a simple login test case to help you get started with manual testing.

Manual Test Case for Login

Below is a sample test case for manually testing a login feature.

Test Case ID: TC_LOGIN_001
Description: Verify that a user can log in with valid credentials.
Preconditions: User has valid username and password; application is accessible.

Test Steps:

Navigate to the login page at https://www.saucedemo.com/.
Enter "standard_user" in the username field.
Enter "secret_sauce" in the password field.
Click the "Login" button.

Here are the detailed Test Cases For Registration and Login Page.

5. Automation Testing

Automation testing helps run repeated tests quickly. In this section, you’ll learn about tools like Selenium, Playwright, and Cypress, with an easy example to get you started.

Key Automation Frameworks

Example: Selenium Test Script for Login

This is a simple Selenium WebDriver test in Java and python. It launches Chrome, goes to the Sauce Demo login page, fills in the username and password (standard_user and secret_sauce), clicks the login button, and then checks if the page title shows “Swag Labs” to confirm you’ve logged in successfully. At the end, it closes the browser.

Java

package ActionsTest;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;

public class ExampleLoginTest {
    public static void main(String[] args) {
        // Set path to chromedriver if not set in system PATH
        // System.setProperty("webdriver.chrome.driver", "path/to/chromedriver");

        WebDriver driver = new ChromeDriver();

        // Open the website
        driver.get("https://www.saucedemo.com/");

        // Enter username
        driver.findElement(By.id("user-name")).sendKeys("standard_user");

        // Enter password
        driver.findElement(By.id("password")).sendKeys("secret_sauce");

        // Click submit button
        driver.findElement(By.id("login-button")).click();

        // Assert page title contains "Welcome"
        if(driver.getTitle().contains("Swag Labs")) {
            System.out.println("Test Passed!");
        } else {
            System.out.println("Test Failed!");
        }

        // Close the browser
        driver.quit();
    }
}

Python

from selenium import webdriver
from selenium.webdriver.common.by import By

# Initialize Chrome driver
driver = webdriver.Chrome()

# Open the website
driver.get("https://www.saucedemo.com/")

# Enter username
driver.find_element(By.ID, "user-name").send_keys("standard_user")

# Enter password
driver.find_element(By.ID, "password").send_keys("secret_sauce")

# Click login button
driver.find_element(By.ID, "login-button").click()

# Check if page title contains "Swag Labs"
if "Swag Labs" in driver.title:
    print("Test Passed!")
else:
    print("Test Failed!")

# Close the browser
driver.quit()

Output:

Screenshot-2025-05-21-150012 — Output in java

Screenshot-2025-05-21-150248 — Output in python

6. Performance and Security Testing

Performance and security are very important for apps today. In this section, we’ll learn how to test if an app can handle many users and stay safe using tools like JMeter. This helps make sure apps run fast and protect data.

Performance Testing

Performance testing checks how fast, scalable, and stable your software is when many users are using it at the same time.

Security Testing

Security testing finds weaknesses in your software to keep user data safe and secure.

7. API and Mobile Testing

APIs and mobile apps are key parts of today’s software. They need special testing to make sure they work well and run smoothly on different devices. This section covers API testing with Postman and mobile app testing with Appium.

API Testing

API testing checks that the interfaces between software components work correctly and perform well.

Example: Test a GET request in Postman

json

GET https://www.saucedemo.com/users
Headers: Authorization: Bearer 
Expected Response: 200 OK, JSON user list

Best Practices for REST API Testing in 2025

Mobile Testing

Mobile testing ensures apps run smoothly on different devices and operating systems.

8. Testing Tools and Frameworks

Testing tools help speed up and organize the testing process, making it easier to automate and manage tests in today’s fast-moving software world. This section introduces key tools like Selenium, Playwright, and TestRail, along with practical examples to guide you in choosing the right tools for web, mobile, or API testing.

Manual Testing Tools

Manual testing tools help track bugs, organize test cases, and manage test case workflows without code automation.

Automation Testing Tools

Automation tools increase testing speed by running repetitive tests automatically across browsers, apps, and APIs, which cause saving time and reducing errors.

Performance Testing Tools

Performance tools simulate real user traffic to see how software handles stress and heavy usage, helping ensure it stays fast and stable.

Security Testing Tools

Security tools scan applications to find vulnerabilities and protect against threats.

Burp Suite
Other Security Testing Tools.

CI/CD Integration Tools

CI/CD tools automate testing within the development workflow, helping teams deliver updates faster and with fewer errors.

Choosing the Right Tool

Choose tools based on your project needs whether it’s web or mobile testing along with your team’s skills and budget. Open-source options like Selenium are free and flexible, while commercial tools like LoadRunner provide powerful features for complex testing.

How to Choose the Right Testing Tool?

9. Advanced Testing Concepts

In this section, we’ll explore AI-powered testing tools that automatically create and maintain tests, the shift-left approach to testing earlier in development, and cloud testing for scalable environments.

10. Software Testing interview Questions

Interview preparation is key to landing QA roles in 2025. This section offers a handy list of automation, manual, and API testing questions organized by role and difficulty to help you confidently show off your skills

Best Approach to Learn Software Testing

A structured learning path accelerates mastery of software testing. This section outlines a step-by-step approach, including 2025 trends like AI testing and cloud testing, with projects and community resources to build hands-on skills.

Understand SDLC, STLC, and testing principles.
Learn Java or Python for automation.
Master TestRail for manual testing.
Practice Selenium, Playwright, or Cypress automation.
Explore JMeter and OWASP ZAP for performance and security.
Test open-source projects on GitHub.
Join Ministry of Testing or Test Automation University.
Follow 2025 trends: AI testing, low-code platforms, containerized testing.

By following this structured approach, you’ll gain both the foundational knowledge and practical experience to do effectively testing.

For more check out: How to Become a Software Tester in 2025

Software Testing Certifications

Certifications validate expertise and boost career opportunities in QA, automation, and DevOps roles. This section lists top certifications like ISTQB and Selenium Professional, with details on costs and opportunities, helping you plan your career in 2025.

Certification	Experience	Details	Fees	Post-Certification Opportunities
ISTQB Foundation Level	Beginner	Covers testing principles, test design, and management.	$250 / ₹20,000	QA Tester, Junior QA Engineer
ISTQB Agile Tester	1-2 years	Focuses on testing in Agile environments.	$200 / ₹16,000	Agile Tester, QA Analyst
Certified Software Tester (CSTE)	2+ years	Emphasizes test planning, execution, and metrics.	$350 / ₹28,000	QA Engineer, Test Lead
Selenium Professional Certification	1-2 years	Validates Selenium automation skills.	$300 / ₹24,000	Automation Tester, SDET

For more check out: Software Testing Certifications in 2025

Career & Jobs in Software Testing 2025

Software testing offers various career paths in 2025, from QA engineering to SDET roles. This section highlights in-demand roles, salaries, and skills like automation and cloud testing, with tips to build a successful career.

Career	Average Salary (INR)	Average Salary (USD)
QA Engineer	₹500,000 – ₹1,500,000	$50,000 – $100,000
Automation Tester	₹700,000 – ₹2,000,000	$70,000 – $120,000
Performance Test Engineer	₹800,000 – ₹2,200,000	$80,000 – $130,000
Security Tester	₹900,000 – ₹2,500,000	$90,000 – $150,000
SDET	₹1,000,000 – ₹2,800,000	$100,000 – $160,000

For more check out: Top Skills for Software Testers in 2025

Companies Using Software Testing

Top tech companies depend on software testing to keep their products reliable, from cloud services to mobile apps. This section showcases how Google, Amazon, and others use testing, emphasizing its critical role in 2025’s tech landscape.

Company	Software Testing Focus
Google	Tests cloud services, AI, and apps for reliability.
Amazon	Ensures quality for AWS, e-commerce, and Alexa.
Microsoft	Validates Windows, Azure, and enterprise software.
Meta	Tests Facebook, Instagram, and WhatsApp for performance.
Netflix	Ensures seamless streaming and algorithm accuracy.
Infosys/TCS	Provides testing services for global clients.
Salesforce	Tests CRM and cloud-based applications.

What is Software Testing?

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