Understand exactly what you are pointing that if there are some default values set for the properties at variouls levels (project, testsuite, test cases), they are getting changed at the end. When the project is about to commit, there are lot of diffs which are not actually unwanted.
There can be ways todo what you are looking for:
1. have a tear down to set the properties to have default values.
2. One way to do is have a property files with default values for custom properties used in project, load them at end. But, this would be very easy if all the properties at one level and may be tedious if properties present at multiple levels (first option be little simple in this case).
