Testing software before doing an update image.

• We have a test-rpm-install/test-deb-install that takes a clean machine, installs the package, and gets a before/after snapshot of the entire filesystem.

• That way you ensure that your package is affecting just what you had in mind, and nothing more.

• This also lets you show 'this is what I'm changing' list along with your testing notes when you submit a package for inclusion review in the next image.

• You can also pick up side effect of restarting a daemon if it creates, modifies, or removes files.

• Then all the files are automatically reverted for the next test.