Non functional Testing

Usability

• Is it fit for purpose?
• Measures the capacity the application has to meet its users needs.
• Hailway testing to look for show-stoppers. 

Accessibility

• Accessibility testing is a subset of usability testing.
• Where the users under consideration have disabilities that affect how they use the application.
• The goal, in both usability and accessibility , is to discover how easily people can use a website and feed that information back into improving feature designs and implementations.

Performance Load Testing

• Simplest form of performance testing.
• Understand the behavior of the system.
• Expected concurrent number of users on the applications.
• Performing a specific number of transactions within the set duration.
• Response times of all the important business critical transactions.
• Point towards bottlenecks in the application software.

Stress Testing

• Understand the upper limits of capacity within the system.
• Determine the system's robustness in terms of extreme load.
• Helps application admin to determine if the system will perform sufficiently if the current load goes well above the expected maximum.

Soak Testing

• Known as endurance testing.
• Determine if the system can sustain the continuous expected load.
• Memory utilization is monitored to detect potential leaks.
• Performance degradation i.e. to ensure that the throughput and/or response times after some long period of sustained activity are as good as or better than at the beginning of the test.

Spike Testing

• Suddenly increasing the load generated by a very large number of users.
• Observing the behavior of the system.
• To determine whether performance will suffer, the system will fail or it will be able to handle dramatic changes in load.

Configuration Testing

• Tests are created to determine the effects of configuration changes.
• Changing the connection method on a communication port.

Isolation Testing

• Involves repeating a test execution that resulted in a system problem.
• Such testing can often isolate and confirm the fault domain.

Security Testing

• Scanning
• Vulnerability analysis.
• Penetrating test.
• Feedback

Scanning

• Network Interrogation.
• Number of hosts.
• What are the hosts?
• What services are running?
  

Penetration testing tools

• Metasploit
• Cain & Able

Reporting

• Full disclosure
• Responsible disclosure
  

Scalability

•  Testing of a software application for measuring its capability to scale up or  scale out in terms of any of its non-functional capability.
• How do hardware and software changes affect the server performance?

Capability 

• Used to find the boundaries within an application, how much can it take before things start to go wrong.

Portability

• Testing your application in a new environment.

Maintainability

• Corrective
• Adaptive
• Perfective
• Preventative

Supportability (Serviceability)

• Help desk notification of exceptional events.
• Network monitoring.
• Documentation
• Event logging/Tracing
• Logging of program state.
• Software upgrade.
• Graceful degradation.

Testability

• The ability in which a piece of software will respond to a given test.

Disaster recovery and business continuity

• Verify the success of a service of a service restoration after a disaster.
• What happens to the workload if the system becomes unavailable.
• How long does recover take.
• How does the application cope with partial network failure.