# Definitions ## Unit test A unit test tests the smallest testable part of an application (a unit). For our purposes, this is a function. ## Integration test An integration test combines two or more individual units and tests them as a group. ## End-to-end test An end-to-end test tests a flow from start to end and validates different integrated components of an application. End-to-end Testing tests the integrity of the integrated components as well as the integrity of the whole system. ## System testing A system test tests a complete, integrated system as a whole to evaluate the system's compliance with its specified requirements. System testing falls within the scope of black-box testing, and as such, should require no knowledge of the inner design of the code or logic. --- # 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://newtons.gitbook.io/knowledge/jest/definitions.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.