# Functional Testing In functional testing, we focus on validating IoT platform correctness against the data sent by our simulated devices. The simulator is capable of validating server responses, and also fetching data via REST APIs in order to query system correctness. Let's have a few examples:- * In [Basic Functional Test](/iot-testing/iot-functional-testing/basic-iot-platform-functional-test.md), we will learn how to send a simple data to a server and validate the server response with using **assert()** function. * In [Geofencing ](/iot-testing/iot-functional-testing/geofencing-validation.md)example, we will see how server disables ignition of a driving vehicle, if the vehicle move beyond 1000 meter radius of its starting position. --- # 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://docs.iotify.io/iot-testing/iot-functional-testing.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.