# Writing tests ## Adding a new test Midio comes with a simple interface for writing and running tests, found in the [`Testing`](https://docs.midio.com/midio-docs/built-in-nodes/core-std#testing) module. To add a test, first add a [`Testing Test`](https://docs.midio.com/midio-docs/built-in-nodes/core-std#test) event node, and give it a name.

If you open the 'Services' panel and click the 'refresh services list' button, you will get a new item called **Testing**. Click it to get an overview of all your tests, and buttons to execute them.

## Assertions The Testing module contains several functions which can be used to perform assertions during a test, like `Testing.AssertEqual`. These functions can only be used in the context of a test, and will report to the testing service whether they pass or fail.

You can then click on the **Run all** button to run all tests, or the individual **Run** buttons to run a single test at a time.

## Tips Clicking on a test in the services panel will make the editor jump directly to where that test is defined.