TPF development has some great "ready to use" drivers available for testing. The source code is also available if you want to tweak the driver to test your specific test case.
Here are some examples:
- The HOTx driver to test DASD
- The MQ driver to test many aspects of MQ functionality
- The MEM5 driver to test ECB and heap.
Check out all of the drivers at the z/TPF Driver page