Caution! Deleted Tests can be restored within 30 days. After that time, deleted tests cannot be restored.
Only users with Mass Edit permission can delete Tests.
From within a Project -
Hover over the Tests tab and select Test Tree
Right-click on the relevant Test and select Delete
In the Delete dialog box, check the "Items in the Recycle Bin are permanently deleted after 30 days. You can restore it from the Recycle Bin before that time."
Then click on Yes, delete.
To learn how to restore deleted tests, click here.