Web

Web Testing
During testing the websites the following scenarios should 
be considered. 
•   Functionality 
•   Performance 
•   Usability 
•   Server side interface 
•   Client side compatibility 
•   Security

Functionality: 
In testing the functionality of the web sites the following 
should be tested.
 Links 
 Internal links 
 External links 
 Mail links 
 Broken links 
 Forms 
 Field validation 
 Functional chart 
 Error message for wrong input 
 Optional and mandatory fields 
 Database 
 Testing will be done on the database integrity. 
 Cookies 
 Testing will be done on the client system side, on the 
temporary internet files. 

Performance: 
Performance testing can be applied to understand the web 
site's scalability, or to benchmark the performance in the 
environment of third party products such as servers and 
middleware for potential purchase. 
•   Connection speed: 
o   Tested over various Networks like Dial up, ISDN etc 
•   Load 
o   What is the no. of users per time? 
o   Check for peak loads & how system behaves. 
o   Large amount of data accessed by user. 
•   Stress 
o   Continuous load 
o   Performance of memory, cpu, file handling etc. 

Usability : 
Usability testing is the process by which the human-
computer interaction characteristics of a system are 
measured, and weaknesses are identified for correction.
Usability can be defined as the degree to which a given 
piece of software assists the person sitting at the 
keyboard to accomplish a task, as opposed to becoming an 
additional impediment to such accomplishment. The broad 
goal of usable systems is often assessed using several 
criteria:
•   Ease of learning 
•   Navigation 
•   Subjective user satisfaction 
•   General appearance 

Server side interface: 
In web testing the server side interface should be tested. 
This is done by
Verify that communication is done properly.
Compatibility of server with software, hardware, network 
and database should be tested.
The client side compatibility is also tested in various 
platforms, using various browsers etc.

Security: 
The primary reason for testing the security of an web is to 
identify potential vulnerabilities and subsequently repair 
them. 
The following types of testing are described in this 
section: 
•   Network Scanning 
•   Vulnerability Scanning 
•   Password Cracking 
•   Log Review 
•   Integrity Checkers 
•   Virus Detection

Performance Testing 
Performance testing is a rigorous usability evaluation of a 
working system under realistic conditions to identify 
usability problems and to compare measures such as success 
rate, task time and user satisfaction with requirements.
The goal of performance testing is not to find bugs, but to 
eliminate bottlenecks and establish a baseline for future 
regression testing.

To conduct performance testing is to engage in a carefully 
controlled process of measurement and analysis. Ideally, 
the software under test is already stable enough so that 
this process can proceed smoothly.
A clearly defined set of expectations is essential for 
meaningful performance testing.
For example, for a Web application, you need to know at 
least two things:
•   expected load in terms of concurrent users or HTTP 
connections 
•   acceptable response time 

Load testing:
Load testing is usually defined as the process of 
exercising the system under test by feeding it the largest 
tasks it can operate with. Load testing is sometimes called 
volume testing, or longevity/endurance testing
Examples of volume testing:
•   testing a word processor by editing a very large 
document 
•   testing a printer by sending it a very large job 
•   testing a mail server with thousands of users mailboxes 
Examples of longevity/endurance testing:
•   testing a client-server application by running the 
client in a loop against the server over an extended period 
of time 

Goals of load testing:
•   Expose bugs that do not surface in cursory testing, 
such as memory management bugs, memory leaks, buffer 
overflows, etc. 
ensure that the application meets the performance baseline 
established during Performance testing. This is done by 
running regression tests against the application at a 
specified maximum load. 
Although performance testing and load testing can seen 
similar, their goals are different. On one hand, 
performance testing uses load testing techniques and tools 
for measurement and benchmarking purposes and uses various 
load levels whereas load testing operates at a predefined 
load level, the highest load that the system can accept 
while still functioning properly. 

Stress testing: 
Stress testing is a form of testing that is used to 
determine the stability of a given system or entity. This 
is designed to test the software with abnormal situations. 
Stress testing attempts to find the limits at which the 
system will fail through abnormal quantity or frequency of 
inputs. 
Stress testing tries to break the system under test by 
overwhelming its resources or by taking resources away from 
it (in which case it is sometimes called negative testing). 
The main purpose behind this madness is to make sure that 
the system fails and recovers gracefully -- this quality is 
known as recoverability.
Stress testing does not break the system but instead it 
allows observing how the system reacts to failure. Stress 
testing observes for the following.
•   Does it save its state or does it crash suddenly? 
•   Does it just hang and freeze or does it fail 
gracefully? 
Is it able to recover from the last good state on restart? 
Etc.

Compatability Testing 
A Testing to ensure compatibility of an application or Web 
site with different browsers, OS and hardware platforms. 
Different versions, configurations, display resolutions, 
and Internet connect speeds all can impact the behavior of 
the product and introduce costly and embarrassing bugs. We 
test for compatibility using real test environments. That 
is testing how will the system performs in the particular 
software, hardware or network environment. Compatibility 
testing can be performed manually or can be driven by an 
automated functional or reg The purpose of compatibility 
testing is to reveal issues related to the product’s 
interaction ression test suite.with other software as well 
as hardware. The product compatibility is evaluated by 
first identifying the hardware/software/browser components 
that the product is designed to support. Then a 
hardware/software/browser matrix is designed that indicates 
the configurations on which the product will be tested. 
Then, with input from the client, a testing script is 
designed that will be sufficient to evaluate compatibility 
between the product and the hardware/software/browser 
matrix. Finally, the script is executed against the matrix, 
and any anomalies are investigated to determine exactly 
where the incompatibility lies. 
Some typical compatibility tests include testing your 
application: 
•   On various client hardware configurations 
•   Using different memory sizes and hard drive space 
•   On various Operating Systems 
•   In different network environments 
•   With different printers and peripherals (i.e. zip 
drives, USB’s, etc.)

Source:Web-Testing