Type of API Testing

1. Smoke Testing
2. Functional Testing.
3. Integration Testing
4. Regression Testing
5. Load Testing
6. Stress Testing
7. Security Testing
8. UI Testing
9. Fuzz Testing

Smoke Testing:
Smoke testing is an initial testing process to check whether the most crucial functions of a program are working without any critical errors. It's often performed before more comprehensive testing. Imagine you've developed a web application. During smoke testing, you'd check if the main components, such as the login page, home page, and basic navigation, are functioning correctly without major issues.

Functional Testing:
Functional testing assesses the software's functions by testing each function's input, output, and behavior. For example, consider a banking application. Functional testing would involve testing activities like user authentication, fund transfer, balance inquiry, and transaction history to ensure that each function operates as expected based on its specifications.

Integration Testing:
Integration testing checks the interface between different software modules and ensures that they work together as intended. Imagine you're developing an e-commerce platform. Integration testing would involve verifying that the payment gateway, inventory management system, and user interface all communicate effectively to process orders, update stock, and handle transactions seamlessly.

Regression Testing:
Regression testing ensures that new changes or updates to the software do not adversely affect the existing functionality. Let's say you've added new features to a mobile app. Regression testing would involve retesting the original functionalities like login, data retrieval, and core operations to confirm that the new updates haven't caused any unintended issues or bugs.

Load Testing:
Load testing evaluates the software's performance under normal and peak usage conditions to determine its stability and response time. For instance, if you've developed a video streaming platform, load testing would involve simulating a large number of users accessing the platform simultaneously to assess how well it handles the increased traffic and data load.

Stress Testing:
Stress testing examines the software's behavior under extreme conditions to assess its robustness and determine the breaking point. Consider an online shopping website. Stress testing would involve evaluating how the platform performs when there's a sudden surge in user traffic, heavy load on the servers, or when the database is nearing its maximum capacity.

Security Testing:
Security testing evaluates the software's ability to protect data and maintain the integrity of the system against potential threats and vulnerabilities. If you've developed a mobile banking application, security testing would involve assessing how well the application safeguards user data, prevents unauthorized access, and encrypts sensitive information to prevent security breaches and cyber attacks.

UI Testing:
UI testing focuses on the user interface to ensure that the application's visual elements and user interactions function as intended. Consider a social media platform. UI testing would involve assessing the layout, color scheme, buttons, links, and overall user experience to ensure that the interface is intuitive, visually appealing, and easy to navigate.

Fuzz Testing:
Fuzz testing involves sending invalid, unexpected, or random data inputs to the software to check how it handles these inputs. For instance, if you're testing a messaging application, fuzz testing would involve sending a series of random characters, symbols, and special characters to verify that the application can handle such inputs without crashing or producing unexpected behavior.

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reference from ByteByteGo Blog