Software testing

Software Testing
Mody Univercity,Laxmanghr

Submitted By:Bhagyashree pathak
110077
CS-C

Contents
 Introduction
 Necessity

of testing
 Goals of testing
 Testing methods
 Testing levels
 Testing approach
 Testing types
 Updates Regarding ST
 Conclusion

Introduction
 Testing

is the process of executing a program
with the intention of finding errors.

 Testing

can show the presence of bugs but never
their absence.

 Testing

is quality control activity.

Necessity of Testing



To check the reliability of the software.
To be ensured that the software does not contain
any bug which can become a reason for failure.

 To

check the software was made according to its
specification.

 To

check that users are capable of using the
software.

 To

check software works with other software and
hardware it needs to work with.

Goals of Testing


Detect faults.



Establish confidence in software.



Evaluate properties of software.
-Reliability
-Performance
-Memory Usage
-Security
-Usability

 Static vs. Dynamic Testing


The Box approach
- White-box testing

- Black-box testing

Static vs. Dynamic Testing
 Reviews,

walkthroughs, or inspections are
referred to as Static testing, whereas
actually executing programmed code with
a given set of test cases is referred to as
dynamic testing.

 Static

testing can be omitted, and
unfortunately in practice often is.
Dynamic testing takes place when the
program itself is used.

White box testing
 Testing

based on an analysis of the
internal structure of the component or
system.

 White

box testing uses specific knowledge of
programming code to examine outputs.

 White

box testing is used to test areas that cannot
be reached from a black box level.

Advantages
 As

the tester has knowledge of the
source code, it becomes very easy to find
out which type of data can help in testing
the application effectively.




It helps in optimizing the code.
Extra lines of code can be removed
which can bring in hidden defects.

Disadvantages
 Due

to the fact that a skilled tester is
needed to perform white box testing, the
costs are increased.

 Sometimes it

is impossible to look into
every nook and corner to find out hidden
errors that may create problems as many
paths will go untested.

Black box testing
 It

is a software testing method in which the
internal structure/design/implementation of the
item being tested is not known to the tester.

 These

tests can be functional or
non- functional, though usually functional.

Advantages


Tester can be non-technical.



Used to verify contradictions in actual system
and the specifications.

Disadvantages


The test inputs needs to be from large sample
space.



It is difficult to identify all possible inputs in limited
testing time. So writing test cases is slow and
difficult.

 Unit

testing

- Exercises specific paths in a component's
control structure to ensure complete coverage
and maximum error detection.
- Components are then assembled and integrated.
 Integration testing

- Focuses on inputs and outputs, and how well
the components fit together and work together

Validation testing
-Provides final assurance that the software meets
all functional, behavioral, and performance
requirements.

System testing
-Verifies that all system elements
(software,
hardware, people, databases) mesh
properly and that overall system function and
performance is achieved.

 Bottom-up testing

- It is an approach to integrated testing where the lowest
level components– modules, procedures or functions– are
tested 1st,then integrated and used to facilitate the testing
of higher level components.
- This method also helps to determine the levels of software
developed and makes it easier to report testing progress in
the form of a percentage.

 Top-down testing
- It is an approach to integrated testing where the top
integrated modules are tested and the branch of the module
is tested step by step until the end of the related module.

 Alpha Testing
 Beta Testing
 Functional and

Non-functional Testing

Alpha Testing


This test is the first stage of testing and will be
performed amongst the teams (developer and QA
teams).



Unit testing, integration testing and system testing when
combined are known as alpha testing.



The following will be tested in the application.
- spelling mistakes
- broken links
- cloudy directions

Beta Testing
 The

aim of beta testing is to cover unexpected
errors.

 Testing

when development and testing are
essentially completed and final bugs and problems
need to be found before release.

 These

are released to a limited audience outside of
the programming team.

 The

software is released to groups of people so
that further testing can ensure the product has few
faults or bugs.

Examples of well known beta tests


Microsoft
-one of the most well
known in beta tests in
memory was the beta
for microsoft’s windows 7
operating system and
before that windows vista.

Functional Testing
 Functional

testing refers to activities that verify a
specific action or function of the code.

 The

application is tested by providing input and
then the results are examined that need to confirm
to the functionality it was intended for.

 Functional

tests tend to answer the question of
“can the user do this” or “does this particular
feature work”.

Non-functional Testing
 This

section is based upon the testing of the
application from its non-functional attributes.

 Non-functional testing

of Software involves
testing the Software for the requirements which
are non-functional in nature.

 It

deals with features such as
performance, security, user interface etc.

Updates Regarding ST
Beta testing of web sites
 Facebook timeline

was launched on beta testing.

Gaana.com for online music still on beta
testing..

Conclusion
 Software testing

is an art.
 Testing is more than just debugging.
 Testing is expensive.
 Complete testing is infeasible.
-complete testing is not achievable, and the
amount that we have estimated for production of
any software product is less then the required
amount.

Software testing

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