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Non Functional Testing
An overview

Content:
1. Overview
2. Functional & Non Functional Testing
3. Usability Testing
4. Performance Testing
5. Compatibility Testing
6. Security Testing

Overview: Functional Testing
Functional Testing: Testing the application against business requirements. Functional testing is done using the
functional specifications provided by the client or by using the design specifications like use cases provided
by the design team.
Functional Testing covers:
• Unit Testing
• Smoke testing / Sanity testing
• Integration Testing (Top Down,Bottom up Testing)
• Interface Testing
• System Testing
• Regression Testing
• Pre User Acceptance Testing(Alpha & Beta)
• User Acceptance Testing
• White Box & Black Box Testing
• Globalization & Localization Testing

Overview: Non Functional
Testing
Non-Functional Testing: Testing the application against client's and performance requirement. Non-
Functioning testing is done based on the requirements and test scenarios defined by the client.
Non-Functional Testing covers:
Usability Testing
Performance Testing
• Compatibility Testing
• Security / Penetration Testing
• Recovery Testing
• Data Conversion & Migration Testing
• Operational Readiness Testing
• Installation Testing
• Ergonomic Testing

Usability Testing: Classic non-testable requirement:
"System must be user-friendly."
Usability testing evaluates how easy a system is to learn and use.
Benefits:
• Its easier for sales team to sell a highly usable product.
• Usable products are easy to learn and use.
• Support cost is less for Usable products.
According to the ISO definition usability is the extent to which a product can be used by specified user to
achieve specified goal with effectiveness, efficiency and satisfaction in a specified context of use.
Qualitative Approach:
• Each and every function should available from all the pages of the site.
• User should able to submit each and every request with in 4-5 actions.
• Confirmation message should be displayed for each and every submit.
Quantitative Approach:
• Heuristic Checklist should be prepared with all the general test cases that fall under the classification of
checking.
• This generic test cases should be given to 10 different people and ask to execute the system to mark the
pass/fail status. The average of 10 different people should be considered as the final result.

Heuristic Evaluation – User Testing method, Assessing a product in order to
identify usability problems
> Visibility of system status
> Match between system and the real world
> User control and freedom
> Consistency and standards
> Error prevention
> Recognition rather than recall
> Flexibility and Ease of Use
> Aesthetic & minimalist design
> Help and documentation
> Help users recognise, diagnose & recover
from errors

Performance Testing:
Performance Testing: Testing performed to determine how a system performs in terms of responsiveness and
stability under a particular workload. The goal of performance testing is not to find bugs but to eliminate
performance bottlenecks.
Focus of Performance testing is:
Speed – Determines whether the application responds quickly.
Stability – Determines if the application is stable under varying loads.
Scalability – Determines maximum user load the software application can handle.
Performance Testing to uncovers what needs to be improved before the product goes to market. Without
performance testing application will suffer running slow while several users use it simultaneously, inconsistencies
across different operating systems and poor usability.
Common Performance Problems:

Long Load time

Poor response time

Poor scalability

Bottlenecking
CPU, Memory, Network utilization,
Operating System limitations, Disk usage

Type's of Performance
Testing:Load testing: A load test is usually conducted to understand the behaviour of the system under a specific
expected load. This load can be the expected concurrent number of users on the application performing a
specific number of transaction within the set duration. This test will give out the response times of all the
important business critical transactions.
Stress Testing: Stress Testing is normally used to understand the upper limits of capacity within the system.
This kind of test is done to determine the system's robustness in terms of extreme load and helps
application administrators to determine if the system will perform sufficiently if the current load goes well
above the expected maximum.
Endurance Testing: Endurance Testing is usually done to determine if the system can sustain the continuous
expected load.
Spike testing: Spike testing is done by suddenly increasing the number of or load generated by, users by a
very large amount and observing the behaviour of the system. The goal is to determine whether
performance will suffer, the system will fail, or it will be able to handle dramatic changes in load.
Configuration testing: Configuration testing Rather than testing for performance from the perspective of
load, tests are created to determine the effects of configuration changes to the system's components on
the system's performance and behaviour.
Isolation testing: Isolation testing is not unique to performance testing but a term used to describe
repeating a test execution that resulted in a system problem. Often used to isolate and confirm the fault
domain.

Performance Testing Process:
Demonstrate that your software system meets certain pre-defined performance criteria.
1.Identify your testing environment
2.Identify the performance acceptance criteria
3.Plan & design performance tests
4.Configuring the test environment
5.Implement test design
6.Run the tests
7.Analyze, tune and retest

Thanks You
Sampath kumar Mohan

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Non Functional Testing_Sampath kumar Mohan

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