Hi, If you want to know how much of your private code is tested by your unit tests, there are tools to measure test coverage e.g. NCover. Such a tool may report which code lines are not hit by tests. Usually, each assembly is assigned a minimum coverage that must be reached. A 100% coverage can actually be very difficult to reach. Getting the coverage feedback can be a useful experience. You could get more conscious about how your coding style can make testing easier; branches and exceptions are usually up for discussion. Kind Regards, Keld Ølykke