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Goals of testing
Updates Regarding ST
is the process of executing a program
with the intention of finding errors.
can show the presence of bugs but never
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.
check the software was made according to its
check that users are capable of using the
check software works with other software and
hardware it needs to work with.
Goals of Testing
Establish confidence in software.
Evaluate properties of software.
Static vs. Dynamic Testing
The Box approach
- White-box testing
- Black-box testing
Static vs. Dynamic Testing
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
testing can be omitted, and
unfortunately in practice often is.
Dynamic testing takes place when the
program itself is used.
White box testing
based on an analysis of the
internal structure of the component or
box testing uses specific knowledge of
programming code to examine outputs.
box testing is used to test areas that cannot
be reached from a black box level.
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.
to the fact that a skilled tester is
needed to perform white box testing, the
costs are increased.
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
is a software testing method in which the
internal structure/design/implementation of the
item being tested is not known to the tester.
tests can be functional or
non- functional, though usually functional.
Tester can be non-technical.
Used to verify contradictions in actual system
and the specifications.
The test inputs needs to be from large sample
It is difficult to identify all possible inputs in limited
testing time. So writing test cases is slow and
- Exercises specific paths in a component's
control structure to ensure complete coverage
and maximum error detection.
- Components are then assembled and integrated.
- Focuses on inputs and outputs, and how well
the components fit together and work together
-Provides final assurance that the software meets
all functional, behavioral, and performance
-Verifies that all system elements
hardware, people, databases) mesh
properly and that overall system function and
performance is achieved.
- 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.
- 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.
This test is the first stage of testing and will be
performed amongst the teams (developer and QA
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
aim of beta testing is to cover unexpected
when development and testing are
essentially completed and final bugs and problems
need to be found before release.
are released to a limited audience outside of
the programming team.
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
-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.
testing refers to activities that verify a
specific action or function of the code.
application is tested by providing input and
then the results are examined that need to confirm
to the functionality it was intended for.
tests tend to answer the question of
“can the user do this” or “does this particular
section is based upon the testing of the
application from its non-functional attributes.
of Software involves
testing the Software for the requirements which
are non-functional in nature.
deals with features such as
performance, security, user interface etc.
Updates Regarding ST
Beta testing of web sites
was launched on beta testing.
Gaana.com for online music still on beta
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