Software testing

What is Software?
Software is a set of
instructions stored digitally
within the computer's memory,
which tells the computer system
what to do.

What is Testing?
Testing is the process of executing a
program with the intention of
finding errors

Software testing
Software testing is a process
that should be done during the
development process. In other
words software testing is a
verification and validation
process.

What is Verification?
Verification is the process to
make sure the product satisfies
the conditions imposed at the
start of the development phase.
to make sure the product
behaves the way we want it to.

What is Validation?
Validation is the process to make
sure the product satisfies the
specified requirements at the end
of the development phase.
to make sure the product is built
as per customer requirements.

Difference between Verification
And Validation
Verification Validation
 Verification is to check
whether the software
conforms to
specifications.
 It does not involve
executing the code.
 It is human based
checking of documents
and files.
 Validation is to check
whether software meet
the customer
requirements.
 It always involves
executing the code.
 It is computer based
execution of program.

Difference between Verification
And Validation
Verification Validation
• Verification is done by
development team to
provide that the
software is as per the
specifications
• It, generally, comes
first-done before
validation.
• Validation is carried
out with the
involvement of client
and testing team.
• It generally follows
after verification.

Purpose of Software Testing
Testing verifies that the system
meets the different requirements
including, functional, performance,
reliability, security, usability and so
on.This verification is done to
ensure that we are building the
system right.

Basics of Software Testing
There are two basics of software
testing:
Whitebox testing.
Blackbox testing

What is Whitebox Testing?
 Whitebox Testing is a software testing
method in which the internal structure of
the item being tested is known to the tester.
 White box testing is often used for
verification.
 White box testing is done by the
Developers.

Advantage of Whitebox Testing
 Testing can be commenced at an earlier
stage. One need not wait for the GUI to be
available.
 Testing is more thorough, with the
possibility of covering most paths.
 The other advantage of white box testing is
that it helps in optimizing the code

Disadvantage of Whitebox Testing
 As knowledge of code and internal structure
is a prerequisite, a skilled tester is needed to
carry out this type of testing, which
increases the cost
 Not looking at the code in a runtime
environment...

What is Blackbox Testing?
 Blackbox Testing is a software testing
method in which the internal structure of
the item being tested is not known to the
tester..
 Blackbox testing is often used for
Validation..
 Black box testing is done by the professional
testing team.

Advantage of Blackbox Testing
Tester can be non-technical.
Tester needs no knowledge of
implementation, including specific
programming languages
Tests will be done from an end user's
point of view. Because end user should
accept the system.

Disadvantage of Blackbox Testing
Not all properties of a software product
can be tested
The reason for a failure is not found.
Only a small number of possible inputs
can be tested and many program paths
will be left untested..

 Types of Testing
There are many types of testing like
Unit Testing
Integration Testing
Functional Testing
System Testing
Stress Testing

Types of Testing
Performance Testing
Usability Testing
Acceptance Testing
Regression Testing
Beta Testing

Unit Testing
Unit testing is that validate individual
unit of source code working properly…
Unit is smallest testable part of an
application..
Mostly done by developers of the
modules..

Goal of Unit Testing
• To isolate each part of program
and show that individual parts
are correct..

Advantage of Unit Testing
 Unit Testing reduces the level of bugs
in production code..
 Unit Testing inspires confidence..
 Unit Testing makes it easier to change
and refactor code.

Disadvantage of Unit Testing
Unit-testing will not catch every
error in the program. By definition,
it only tests the functionality of the
units….

Integration Testing
Integration testing is testing in which a
group of components are combined to
produce output.
 Also, the interaction between software
and hardware is tested in integration
testing if software and hardware
components have any relation.

Integration Testing
• Prerequisite of Integration Testing
•Before We begin Integration Testing
it is important that all the
components have been successfully
unit tested..

Goal of Integration Testing
To discover faults that are due to
incorrect interaction
Between different software module.

Integration Testing
Types of Integration Testing
Top-down testing
 Top Down Integration as the term
suggests, starts always at the top of the
program hierarchy and travels towards
its branches..

Integration Testing
• Bottom –Up Testing
•Bottom –Up integration as it name
implies starts at the lowest level in
the program structure.

Functional Testing
Functional testing is the testing to
ensure that the specified
functionality required in the
system requirements works.
it is not concerned about the
source code of the application.

Functional Testing
 What do you test in Functional Testing?
 The prime objective of Functional testing is
checking the functionalities of the software
system.
 Mainline functions: Testing the main
functions of an application
 Basic Usability: It involves basic usability
testing of the system. It checks whether an
user can freely navigate through the screens
without any difficulties.

Functional Testing
 Accessibility: Checks the accessibility of the
system for the user
 Error Conditions: Usage of testing techniques to
check for error conditions. It checks whether
suitable error messages are displayed

Software testing

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