The full way to test Anaconda modifications is to build a new ISO, see 
Mitel SME Server Custom Anaconda Installer How To
There is a quicker way though to test minor modifications to anaconda.
- Create an otherwise empty directory containing your modified python source file (eg mitel_text.py).
- Use mkcramfs to make a filesystem image file e-smith/base/updates.img (within your cd image tree) from this directory.
- Use mkisofs to make an iso image from your cd directory tree.
- Test.
More details will be added later.