You can do a test run of your deposition before the real thing to make sure everything works correctly by using the Mock Deposition feature. 

From the deposition home screen, click the "Conduct Mock" button in the control panel.

You will be shown the following warning message:

Read through the warning carefully. The main take away is that nothing you do in a Mock deposition is saved. Once you hit Ok, you are in a mock deposition. 

Conducting a mock deposition works the same as a regular deposition. The only difference is that mock deposition notices and watermarks are added.