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softwaretestinghelp . com / software-installationuninstallation-testing/

To install an application it need memory .Make sure no memory is available in the disk and try to install see what happens next .

1) start the script?
2) can it install the app correctly?
3)in case of a failure, is the rollback successful.
4)manually stop the script int he middle and see if a rollback is possible

For testing an installer, we can consider the following:
1) Invoke the installer (it should give an option to select languages - defaulting to the system's language)
2) It should check for valid system configuration, if it is invoked on an unsupported environment , it should prompt user and terminate installation.
3) It should check for prior installed versions and provide an option to upgrade - instead of reinstalling the whole app, it should install the delta