Software Testing is the process of evaluating a software application to ensure it meets specified requirements and works as expected. It involves identifying bugs, errors, or missing requirements before the software is delivered to users.
- Ensures quality and reliability
- Detects bugs early, reducing cost
- Improves performance and security
- Enhances user experience
Types of Software Testing
Types of Software Testing mainly categorized into the two domain, which are below.
1. Manual Testing
Manual Testing is a software testing technique in which test cases are executed manually without using automation tools. Testers verify application functionality by executing test scenarios and comparing actual results with expected results.
2. Automation Testing
Automation Testing It is a technique where the Tester writes scripts independently and uses suitable Software or Automation Tools to test the software. It is an Automation Process of a Manual Process. It allows for executing repetitive tasks without the use of a Manual Tester.
Based on Testing Approach
1. Functional Testing: Functional testing verifies that the application works according to specified requirements. It focuses on validating features and user interactions.
- Tests core features like login, registration, payment
- Ensures correct input–output behavior
- Based on business requirements
2. Non-Functional Testing: Non-functional testing evaluates the performance and quality attributes of the system. It ensures the application is fast, secure, and user-friendly.
- Includes performance, load, and stress testing
- Checks usability and security aspects
- Focuses on system behavior under different conditions
Based on Code Knowledge
1. Black Box Testing: Black box testing checks functionality without knowing internal code. It focuses only on inputs and expected outputs.
- No knowledge of code required
- Based on requirements and user perspective
- Used for functional testing
2. White Box Testing: White box testing involves testing with knowledge of internal code structure. It focuses on logic, conditions, and code paths.
- Requires programming knowledge
- Tests loops, conditions, and branches
- Ensures code correctness and coverage
Need for Software Testing
Software bugs can cause serious consequences, including financial loss, system failures, and even loss of life. Some real-world examples highlight its importance:
- 1985: Therac-25 radiation machine malfunction caused deaths and injuries.
- 1994: China Airlines crash due to a software bug killed 264 people.
- 1996: U.S. bank error credited $920 million to 823 customers.
- 1999: Software bug led to failure of a $1.2B military satellite launch.
- 2015: F-35 fighter jet bug affected target detection.
- 2015: Bloomberg terminal crash disrupted 300,000 traders.
- Starbucks: POS failure shut down 60% of outlets in the U.S. and Canada.
- Nissan: Recalled 1 million cars due to airbag software issues.
Note: These examples show that software testing is critical for ensuring reliability, safety, and performance.
Important Terms in Software Testing
- Test Case: A set of inputs, conditions, and expected results used to verify whether a specific functionality of the software works correctly.
- Test Suite: A collection of multiple test cases grouped together to test different features of an application in various scenarios.
- Test Plan: A document that defines the scope, objectives, resources, schedule, and approach for testing activities.
- Defects/Bugs: Errors or issues in the software where actual results differ from expected results, affecting functionality or performance.
- Regression Testing: Testing performed after changes or updates to ensure existing features still work correctly and no new issues are introduced.
Common Tools Used in Software Testing
- Selenium: An open-source automation tool used for testing web applications. It supports multiple programming languages like Java, Python, and C#.
- JIRA: A popular tool for bug tracking, issue management, and project tracking. It helps teams manage defects efficiently.
- TestNG: A testing framework used with Selenium for organizing test cases, generating reports, and managing test execution.
- Postman: A tool used for API testing. It allows testers to send requests, validate responses, and automate API tests.
- LoadRunner: A performance testing tool used to simulate multiple users and analyze system behavior under load.