# System Variables Testery sets System Variables that get passed to the tests as standard environment variables. They may be accessed using the standard method of accessing environment variables in your testing framework. These values may be useful to you for logging and debugging purposes. If you're looking for how to set variables in Testery that can vary by environment and will get passed in to your test runs, see[ Environments - Variables](https://docs.testery.io/set-up-your-test-environments#variables). * `IS_TESTERY` - Set to TRUE if the tests are running in the Testery platform. Useful for writing tests that perform differently when running in the platform. * `TESTERY_CHROME_ARGS` - Arguments that should be passed to Chrome if you are manually launching it in your tests. * `TESTERY_TEST_RUN_KEY` - A unique key string given to each test run. * `TESTERY_TEST_RUN_ID` - A unique numeric id given to each test run. * `TESTERY_ENVIRONMENT_URL` - The Environment URL set on the Environment. See Setting Up Environments. --- # 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.testery.io/get-to-know-testery/system-variables.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.