Software testing is a systematic process of evaluating a software application, website, or system to verify that it works according to its specified requirements and behaves as expected. Testing helps identify defects, errors, missing requirements, usability problems, security issues, and other problems before software is delivered to users.
In a professional software development environment, testing is an important part of the Software Development Life Cycle (SDLC) and Software Testing Life Cycle (STLC). Testers work with developers, business analysts, product owners, and other stakeholders to verify application quality.
Software testing can be performed manually by executing test cases as a human tester or automatically using automation tools such as Selenium. JustAcademy's Selenium training curriculum begins with software testing and QA concepts before moving into Selenium automation, WebDriver, test frameworks, data-driven testing, and real-world projects. Learn more about Selenium Training at JustAcademy.
Software testing is the process of checking and evaluating software to determine whether it satisfies specified requirements and produces the expected results.
The main purpose of testing is not simply to find errors. Testing also provides information about software quality, reliability, usability, performance, security, and compliance with business requirements.
Software testing means checking whether software works correctly according to its requirements and identifying problems before users experience them.
Suppose an e-commerce application has a login page with the following requirements:
A tester creates test cases to verify each of these requirements.
Test Case: Valid Login
Input:
Email: [email protected]
Password: Test@123
Expected Result:
User should successfully log in
and navigate to the dashboard.If the application does not navigate to the dashboard after valid credentials, the tester identifies the behavior as a defect and reports it.
Software applications are often complex and contain thousands or millions of lines of code. Developers may introduce defects while implementing new features, modifying existing functionality, integrating APIs, changing databases, or fixing previous issues.
Testing helps identify these problems before the application reaches end users.
Software testing has several objectives depending on the application, project, and testing stage.
The tester attempts to discover incorrect behavior, crashes, incorrect calculations, broken workflows, and other defects.
Testing verifies whether the implemented software satisfies the functional and business requirements.
Testing helps determine whether the application behaves appropriately from the user's perspective.
Testing provides information that helps development teams improve the quality and reliability of software.
Testing reduces the possibility of releasing software with serious defects that could affect users or business operations.
Test results provide stakeholders with information that can be used when deciding whether a build is ready for release.
A typical testing process can be represented as:
Requirements
↓
Test Planning
↓
Test Case Design
↓
Test Environment Setup
↓
Test Execution
↓
Defect Identification
↓
Defect Reporting
↓
Retesting
↓
Regression Testing
↓
Test ClosureThe testing team studies requirements to understand what the application should do.
The team determines testing scope, resources, tools, timelines, environments, risks, and testing strategies.
Testers create test scenarios and test cases based on requirements.
The required hardware, software, browsers, databases, servers, test data, and other components are prepared.
Test cases are executed and actual results are compared with expected results.
When actual behavior differs from expected behavior, the tester reports a defect with relevant information.
After developers fix a defect, the tester executes the failed test again to verify the fix.
Previously working functionality is tested to ensure that new changes have not introduced unintended problems.
After the required testing activities are completed, the team prepares test results, reports, metrics, and lessons learned.
Quality Assurance (QA) is a broader discipline focused on improving and maintaining processes that help produce quality software.
Software Testing focuses on evaluating software and identifying problems in the product.
| Quality Assurance | Software Testing |
|---|---|
| Focuses on processes | Focuses on the software/product |
| Primarily preventive | Primarily identifies defects through evaluation |
| Improves development and quality processes | Checks application behavior |
| Includes process improvement | Includes test design and execution |
QA and testing work together to improve the overall quality of software.
Software testing can generally be performed manually or with automation.
| Manual Testing | Automation Testing |
|---|---|
| Tests are executed by testers manually. | Tests are executed using automation tools and scripts. |
| Suitable for exploratory and usability testing. | Useful for repetitive and regression testing. |
| Usually requires human interaction for each execution. | Scripts can execute repeatedly with limited manual interaction. |
| Test execution can take more time for large repetitive suites. | Large repetitive suites can often be executed more efficiently. |
| Human observation is central. | Automation scripts perform predefined actions and validations. |
Automation does not replace every form of manual testing. Human judgment remains important for areas such as exploratory testing, usability evaluation, and scenarios that are difficult to automate reliably.
Automation testing is the use of software tools and scripts to execute predefined tests, interact with applications, compare actual and expected results, and generate test results.
For web application automation, Selenium WebDriver is commonly used to automate browser interactions. JustAcademy's Selenium curriculum includes Selenium WebDriver, web elements, locators, browser automation, TestNG, data-driven testing, Page Object Model, cross-browser testing, reporting, CI/CD, and practical automation projects. Explore the Selenium Training Course.
driver.get("https://example.com/login");
driver.findElement(By.id("username"))
.sendKeys("[email protected]");
driver.findElement(By.id("password"))
.sendKeys("Test@123");
driver.findElement(By.id("loginButton"))
.click();The automation script performs browser interactions programmatically.
Software testing can be classified in several ways.
Functional testing verifies whether application features work according to specified functional requirements.
For a login page, a tester may verify:
Non-functional testing evaluates characteristics other than specific business functions.
Smoke testing is a preliminary level of testing used to determine whether a build is stable enough for more detailed testing.
For example, after receiving a new application build, testers may verify:
If critical functionality is completely broken, detailed testing may be postponed until the build becomes testable.
Sanity testing is focused testing performed after specific changes or fixes to verify that the affected functionality works as expected and the build is suitable for further testing.
Example:
If a developer fixes the password-reset functionality, the tester may focus on the password-reset flow and closely related functionality.
Regression testing verifies that changes to an application have not negatively affected existing functionality.
Example:
Suppose a developer changes the checkout module. Regression testing may include:
Automation tools such as Selenium can be useful for repeatedly executing regression test suites.
Retesting means executing a previously failed test again after the reported defect has been fixed.
Initial Test
↓
Test Failed
↓
Defect Reported
↓
Developer Fix
↓
Retest
↓
Pass / Fail| Retesting | Regression Testing |
|---|---|
| Checks whether a specific defect has been fixed. | Checks whether changes have affected existing functionality. |
| Focuses on previously failed test cases. | May cover a broader set of existing functionality. |
| Usually performed after defect correction. | Performed after changes that could introduce side effects. |
Unit testing verifies individual units or small components of software, such as functions, methods, or classes.
Unit tests are commonly written and maintained by developers.
Example:
Function:
calculateTotal(price, quantity)
Input:
price = 100
quantity = 3
Expected:
300Integration testing verifies whether multiple software components work correctly when they interact with one another.
Mobile/Web Application
↓
Backend API
↓
Database
↓
Payment ServiceIntegration testing checks whether these components communicate correctly.
System testing evaluates the complete integrated application against its specified requirements.
For example, an e-commerce system may be tested from login through product selection, cart, checkout, payment, and order confirmation.
Acceptance testing determines whether the software satisfies business or user acceptance criteria.
It is generally performed toward the end of a development cycle before a release or deployment decision.
In black box testing, the tester evaluates software behavior without requiring knowledge of the application's internal source-code implementation.
The tester focuses on:
White box testing involves knowledge of the internal implementation or source code.
It can involve testing:
Grey box testing combines aspects of black box and white box testing. The tester has partial knowledge of the internal implementation while primarily evaluating application behavior.
A test case is a documented set of steps, inputs, conditions, and expected results used to verify a specific software behavior.
| Field | Example |
|---|---|
| Test Case ID | TC_LOGIN_001 |
| Test Scenario | Valid Login |
| Precondition | User account exists |
| Test Data | Valid username and password |
| Steps | Open login page, enter credentials, click Login |
| Expected Result | User should reach dashboard |
| Actual Result | Recorded during execution |
| Status | Pass / Fail |
A test scenario represents a high-level situation or functionality that needs to be tested.
For an e-commerce application:
A scenario can contain multiple detailed test cases.
A defect is a problem in software where the actual behavior does not match the expected behavior or specified requirement.
Requirement: Clicking the Login button with valid credentials should open the dashboard.
Actual behavior: The application remains on the login page.
This difference can be reported as a defect.
A typical defect workflow can look like:
New
↓
Assigned
↓
Open
↓
Fixed
↓
Retest
↓
Verified
↓
ClosedDepending on the organization's process, additional states such as Reopened, Rejected, Duplicate, Deferred, or Not a Bug may also be used.
Severity describes the impact of a defect on the application.
Priority describes how urgently the defect should be addressed from a project or business perspective.
| Severity | Priority | Example |
|---|---|---|
| High | High | Application crashes during checkout |
| High | Low | Important issue in a rarely used feature |
| Low | High | Critical business text or branding issue |
| Low | Low | Minor cosmetic issue |
STLC represents a structured sequence of testing activities performed during a software project.
Requirement Analysis
↓
Test Planning
↓
Test Case Development
↓
Test Environment Setup
↓
Test Execution
↓
Defect Reporting
↓
Retesting & Regression Testing
↓
Test ClosureSDLC is a structured approach used to plan, develop, test, deploy, and maintain software.
Testing is therefore not an isolated activity. It is integrated into the broader software development process.
A software tester may be responsible for understanding requirements, designing test cases, executing tests, reporting defects, performing regression testing, documenting results, and communicating quality-related information to the team.
Automation can reduce repetitive manual effort by allowing predefined test steps to be executed through scripts and automation tools.
Test Script
↓
Automation Tool
↓
Browser
↓
Web Application
↓
Actual Result
↓
Assertion / Validation
↓
Test ReportSelenium is specifically designed for automating web browser interactions. The JustAcademy Selenium course covers WebDriver, locators, browser automation, waits, TestNG, automation frameworks, reporting, Selenium Grid, CI/CD, and practical projects. Visit JustAcademy's Selenium Training Course.
Consider an online shopping application.
Different tools are used for different testing requirements.
| Tool / Category | Purpose |
|---|---|
| Selenium | Web browser automation |
| TestNG | Test execution and test management |
| JUnit | Java testing framework |
| PyTest | Python testing framework |
| Jenkins | CI/CD automation |
| Git | Version control |
| Jira | Issue and defect tracking |
| Postman | API testing |
Understanding software testing fundamentals is important before learning Selenium because Selenium is an automation tool, not a replacement for testing knowledge.
A Selenium tester should understand concepts such as:
After understanding these concepts, Selenium can be used to automate suitable web application test cases.
Test Case: Login with Valid Credentials
1. Open browser.
2. Navigate to login page.
3. Enter username.
4. Enter password.
5. Click Login.
6. Verify dashboard is displayed.WebDriver driver = new ChromeDriver();
driver.get("https://example.com/login");
driver.findElement(By.id("username"))
.sendKeys("[email protected]");
driver.findElement(By.id("password"))
.sendKeys("Test@123");
driver.findElement(By.id("loginButton"))
.click();
String title = driver.getTitle();
System.out.println(title);
driver.quit();The automated test follows the same logical test scenario but uses Selenium WebDriver to interact with the browser.
Software testing is the process of evaluating software to verify that it satisfies requirements and behaves as expected while identifying defects and other quality problems.
Testing helps identify defects, verify requirements, reduce release risks, and provide information about software quality.
Manual testing involves human execution of test activities, whereas automation testing uses tools and scripts to execute predefined tests.
Regression testing checks whether changes to software have affected previously working functionality.
Retesting means executing a previously failed test again after a defect has been fixed.
A test case is a documented set of steps, inputs, conditions, and expected results used to verify specific functionality.
A defect is a condition in which actual software behavior differs from expected behavior or requirements.
STLC stands for Software Testing Life Cycle and represents the structured testing activities performed during software development.
Functional testing verifies whether software functions behave according to specified functional requirements.
Selenium is used to automate interactions with web applications through supported browsers, making it useful for automated web testing and regression suites.
Take any demo web application and prepare the following test scenarios:
Then select repetitive scenarios and convert them into Selenium automation scripts.
Software Testing Fundamentals
↓
SDLC & STLC
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Test Cases & Test Scenarios
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Functional & Non-Functional Testing
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Manual Testing Concepts
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Programming Basics
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Selenium WebDriver
↓
Locators & Web Elements
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Waits & Browser Interactions
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TestNG
↓
Page Object Model
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Data-Driven Testing
↓
Reporting & Logging
↓
Selenium Grid
↓
CI/CD
↓
Real-World Automation ProjectsSoftware testing is a systematic activity used to evaluate software against requirements and expected behavior. It helps identify defects, verify functionality, assess quality, and reduce the risks associated with releasing software.
Important concepts include functional testing, non-functional testing, smoke testing, sanity testing, regression testing, retesting, unit testing, integration testing, system testing, acceptance testing, test cases, test scenarios, defects, SDLC, and STLC.
For web automation, testers can use Selenium WebDriver to automate suitable browser-based test scenarios. A strong Selenium learning path therefore begins with software testing fundamentals and progresses toward WebDriver, locators, waits, TestNG, frameworks, reporting, cross-browser testing, CI/CD, and real-world automation projects.
For learners who want to continue from software testing fundamentals into Selenium automation testing, the JustAcademy Selenium Automation Testing Course covers areas such as Selenium WebDriver, locators, web elements, TestNG, data-driven testing, Page Object Model, cross-browser testing, automation frameworks, reporting, Selenium Grid, CI/CD, and practical projects.
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After studying this topic, a learner should be able to explain what software testing is, why testing is required, identify major testing types, differentiate manual and automation testing, understand test cases and defects, explain SDLC and STLC, and understand how software testing fundamentals provide the foundation for Selenium automation testing.
