negative testing

Negative TestingPresented By: Anisha Nayak

27/08/2014

2

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A certified professional from ISTQB & V-Skills (Selenium)

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Anisha Nayak, Mindfire Solutions

Anisha Nayak, Mindfire Solutions 3

What is Negative Testing ? Positive view of Negative Testing. Goals of Negative Testing. Techniques of Negative Testing. When do you stop Negative Testing ? Queries.

Agenda


What is Negative Testing ???

Tests aimed at showing that a component or system does not work. Negative testing is related to the testers’ attitude rather than a specific test approach or test design technique, e.g. testing with invalid input values or exceptions.

Negative testing is aimed at showing software does not work.

“Test to fail”


Testing done while providing negative inputs and checking whether it gives some alert messages or not.

It is to check its potential to handle exploitation or external problems.

Its like discovery of faults that result in failures or crashes.

Negative Testing is done only after validating the positive test cases first.

Various opinions on Negative Testing


“Any testing carried out by passing non recommended values with an aim of breaking down the application, taking a look at real world conditions and anticipating potential errors made by end users which are not necessarily looked up by developers/designers. ”

My Understanding


Few checkpoints which defines the positive aspect of Negative testing are as follows :

You do not actually know the way your product is treated in Market, so it’s always good to anticipate bugs before the end users points it.

An eye opener for you, you really tend to find lot of critical issues which might not be caught through normal test approach.

Positive View Of Negative Testing (1/2)


While designing test cases we include both valid and invalid test cases. ‘Invalid’ does not mean that it represents a value that cannot be entered by a user or a value that the user isn’t supposed to enter. It just means that it is not one of the expected inputs for this particular field and the software should correctly handle these values.

Positive View Of Negative Testing (2/2)


It is important to understand the purpose of negative testing. Valuable information about the software’s

functionality, reliability and security breaches are discovered and handled during negative testing.

Diagnosis of the possible causes of failures like crashes and corruption of data.

Identification of the software weaknesses and potential for exploitation.

Goals Of Negative Testing (1/2)


Verification of functionality issues like error-handling(Out of range data, Dates in incorrect format, dd/mm/yyyy instead of the required mm/dd/yyyy).

Goals Of Negative Testing (2/2)


Few very common ways used while doing a Negative testing,

1. Verify each field type.2. Skip the required data entry and try to proceed.3. Enter large values to test the size of the fields.4. Verify the date format and its validity.

Techniques Of Negative Testing

This calls for a

discussion


Negative testing is open ended, so the tester may be tempted to go on even if only minor test failures are encountered.

Negative testing could be exploratory in nature. So, when does a tester stop negative testing?

1. When all your invalid inputs as test cases have been covered.

2. When you do not find any significant issues, you can stop conducting negative testing.

When do you STOP Negative Testing (1/2)


For projects with stiff deadlines, you may need to present the results for verifications and assessments for the risks. Both the developer and the clients or end users, affirm and agree that that no further tests are necessary depending on the priority and status of the issue whether its critical or major/minor.

Negative testing is a powerful and effective approach to discover significant failures, which maybe undetected under normal operations or functions.

When do you STOP Negative Testing (1/2)


Negative testing is viewed by some as a duplicate of the various positive tests conducted during and after the development processes.

Negative testing is a powerful and effective approach to discover significant failures, which maybe undetected under normal operations or functions.

Negative testing is aimed at discovering those ‘hidden’ errors and needs skilled, experienced testers with an eye for details that can be a red signal for possible concerns.

Last But Not The Least (1/2)


It guarantees quality as well as helps in detecting failure, potential errors and builds a strong base for continual product improvement, thus should be a part of the various testing activities during software development.

Last But Not The Least (2/2)

In short you need to Think Negative while doing “NEGATIVE TESTING” to do it the best way.


Lets’ help build a better Quality Product which is free from all potential errors !


Any Queries ???


http://www.exforsys.com/tutorials/testing-types/negative-testing.html

http://blogs.windriver.com/henderson/2010/04/time-to-get-positive-about-negative-testing.html

https://www.linkedin.com/groups/Negative-scenarios-Test-Cases-negative-5181861.S.57918349297047429

References








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