There is a test file in the usual place. You can run it using Netbeans, by right clicking on it and choosing Test file in the Project view.
When run, it should use a file named test.odt from the Project's resources folder.
It should open it, make modifications and then save it as c:\temp\lala.odt
I have modified it to suit my particular testing needs (adding 33 rows and putting text in one of the cells so that to force it to break across pages).
Then I go and inspect the saved file.