# Testing Concepts > In computer programming, unit testing is a procedure used to validate that individual units of source code are working properly. A unit is the smallest testable part of an application. In procedural programming a unit may be an individual program, function, procedure etc, while in object-oriented programming, the smallest unit is always a Class; which may be a base/super class, abstract class or derived/child class. Wikipedia The testing process will take us through a journey of exploration of our software in order to determine its quality, if it met the gathered requirements, work as expected, and provide the required functionality. However, all the testing that we do is mostly controlled and under certain conditions. It is extremely difficult to determine all factors and all software conditions. Therefore attaining a testing nirvana is unrealistic. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://coldbox.ortusbooks.com/v4.x-1/architecture-concepts/testing-concepts.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.