Confirms that the application under test recovers from 
expected or unexpected events without loss of data or 
functionality. Events can include shortage of disk space, 
unexpected loss of communication, or power out conditions.

After develop and unit testing(developers think no defcts 
in application) the entire application,the software has 
been delivered to deployement team(with files like 
dlls/exe/xml...) with the installation notes(steps to 
deplyoment in the server),the deployement team has deployed 
the entire application in the specified servers for 
functional testing and/or before deliver the application to 
client the entire files are latest one or defect fre 
application.

After completing the functionality testing,test engg 
concentrates on installing and uninstalling the build in a 
customer site like environment here test engg verifies
1.if there is a required memory space to install an 
application
2.license agreement
3.check set-up programs are properly installed
4.check for uninstallation.

Installation Testing may be defined as to check all the
other file are creating at the time of installation or not..

Installation testing should take care of the following 
points: - 

1. To check if while installing product checks for the 
dependent software / patches say Service pack3.
2. The product should check for the version of the same 
product on the target machine, say the previous version 
should not be over installed on the newer version.
3. Installer should give a default installation path 
say “C:\programs\.”
4. Installer should allow user to install at location other 
then the default installation path.
5. Check if the product can be installed “Over the Network”
6. Installation should start automatically when the CD is 
inserted.
7. Installer should give the remove / Repair options.
8. When uninstalling, check that all the registry keys, 
files, Dll, shortcuts, active X components are removed from 
the system.
9. Try to install the software without administrative 
privileges (login as guest).
10. Try installing on different operating system.
11. Try installing on system having non-compliant 
configuration such as less memory / RAM / HDD.