> For the complete documentation index, see [llms.txt](https://docs.iotify.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.iotify.io/concepts/understanding-a-test/preview-tests.md).

# Preview Tests

Before we actually start a simulation run, it can be a good idea to validate if a connection can be established to the server. To make sure that we can connect to the server, we will preview the test.

To preview any test, go to the Test Editor and click on the Preview button on the top right of the screen.

<figure><img src="/files/dWAeaW2wlatu75SMa9cN" alt=""><figcaption></figcaption></figure>

When we hit Preview, the simulation engine tries to establish a connection to the server with the authentication and then runs the Init stage of the test.&#x20;

Once the Init stage has been run a report is generated with all the data and displayed to the user.

<figure><img src="/files/9nj8iVGk99eNfdNvGlYe" alt=""><figcaption></figcaption></figure>


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