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What is Testing or Software
Testing means to check whether a
system , software or a application is
working correctelly or not and find
the error , apart from finding errors,
is also used to test performance,
safety, fault-tolerance or security.
Software Testing is a process used
to identify the correctness,
completeness and quality of
developed computer software. It
include a set of activities
conducted with the intent of
finding error in software so that it
could be corrected before the
product is released to end user.
An installation test assures that the system is
installed correctly and working at actual
customer's hardware and,
Check correctness of implementation
Determine how well and how easy a product is
install on a verity of platform configuration.
It is also known as Implementation testing.
O Installation testing is a kind of quality
assurance work in the software industry that
focuses on what customers will need to do to
install and set up the new software
O This testing is typically done by the software
testing engineer in conjunction with the
Usability testing is the process of observing
users’ reactions to a product and adjusting the
design to suit their needs.
The typical aim of usability testing is to cause
the application to fail to meet its usability
requirements so that the underlying defects
can be identified, analyzed, fixed, and
prevented in the future.
Some fairly important things of usability
testing that must be understood.
Users are not testers, engineers or designers.
You are testing the product and not the users.
Selection of end-user evaluators is critical.
Usability testing is a design tool.
In regression testing to test the program again
when changes are made to the program.
It checks whether a small change in any
component of the application affects the
unchanged components or not. This is done by
re-executing and by retesting the program the
previous versions of the application.
When is Regression Testing
Regression Testing plays an important role in
any Scenario where a change has been made
to a previously tested software code.
Any Software Development Project is
invariably faced with requests for changing
Design, code, features or all of them.
Performance testing is testing that is
performed, to determine how fast some aspect
of a system performs under a particular
This testing checks whether the system is
performing properly, according to the user's
Determine how quickly a product execute
verity of event.
It include report on response time of user
command , system throughput, or latency .
Performance testing can serve different
It can demonstrate that the system meets
It can compare two systems to find which
It can measure what parts of the system or
workload causes the system to perform badly.
Performance testing is further divided into
1. Load testing
2. Stress testing
In Load testing we check performance by
multiple users accessing the program
Its a performance testing to check system
behavior under load. Testing an application
under heavy loads, such as testing of a web site
under a range of loads to determine at what point
the system’s response time degrades or fails.
There are numerous possible causes for slow
system performance, including the following:
Application server(s) or software
Network – latency, congestion, etc.
Load balancing between multiple servers
Load testing is especially important if the
application, system or service will be subject to a
service level agreement or SLA.
Stress testing is a form of testing that is used
to determine the stability of a given system or
System is stressed beyond its specifications to
check how and when it fails. Performed under
heavy load like putting large number beyond
storage capacity, complex database queries,
continuous input to system or database load.
In software testing, a system stress test refers to
tests that put a greater emphasis on robustness,
availability, and error handling under a heavy
load, rather than on what would be considered
correct behavior under normal circumstances.
Examples: A web server may be stress tested
using scripts, bots, and various denial of service
tools to observe the performance of a web site
during peak loads.
Security testing tries to confirm
whether the system is capable of
protection from unauthorized
access. During security testing
password cracking, unauthozation
entry into software, network
security are all taken
Testing that confirms, how well a
system protects itself against
unauthorized internal or external,
or willful damage of code; means
security testing of the system.
Security testing assures that the
program is accessed by the
authorized personnel only.
The six basic security concepts that need to
be covered by security testing are: