What term describes the process of testing a small unit of code to ensure it functions correctly?

What term describes the process of testing a small unit of code to ensure it functions correctly?

• A. Xml
• B. Update
• C. Trigger
• D. Unit Testing

Answer: (D)

Unit testing is the practice of validating the smallest testable parts of code, such as a single function or method, in isolation to confirm they work as intended. This approach focuses on the unit's contract—its inputs, outputs, and behavior—within a controlled environment, often with mocks or stubs to stand in for dependencies. The result is fast, repeatable feedback that helps catch regressions when the code changes and supports safer refactoring. The other terms don’t describe this activity: Xml is a markup language for representing structured data; Update refers to applying a new version of software; Trigger denotes an event or mechanism that initiates some action.

Unit testing is the practice of validating the smallest testable parts of code, such as a single function or method, in isolation to confirm they work as intended. This approach focuses on the unit's contract—its inputs, outputs, and behavior—within a controlled environment, often with mocks or stubs to stand in for dependencies. The result is fast, repeatable feedback that helps catch regressions when the code changes and supports safer refactoring. The other terms don’t describe this activity: Xml is a markup language for representing structured data; Update refers to applying a new version of software; Trigger denotes an event or mechanism that initiates some action.