what is positive and negative testing explian with example?

Answer Posted / harry

All of you need to educate yourself. Whenever you answer a
question in interview, make sure you leave no room for
further question being asked due to weak answer. Make sure
you use the appropriate testing terminology to reflect good
answer.
Postive testing is about validating the feature with right
input data so that it could be verified that functionality
works and behaves as per the requirement and need of the
user. (equivalence partitioning)
Negative testing is about:
1. validating the feature on the negative input data where
it shows error message or prompts for the right input etc.
(equivalence partitioning)
2. Breaking the feature by going beyond its negative
validation limit. (this is identified thru Boundary value
which has upper edge on the equivalence partitioning, means
BVA improves the EP)
Note: Both Positive and negative testing helps us find bugs.

The right terminology used for valid and invalid input is
Equivalence partitioning as well as Boundary value
analysis. The positive and negative testing is a straight
influence from these. Once these concepts are clear then
only you can perform the testing. I know that these to
techniques help you to prepare test cases with maximum
coverage of functionality testing which covers positive and
negative test conditions but its obvious that these are the
foundation of positive and negative testing. There is no
limit to perform negative testing but these two techniques
also helps us to define a specific range within which we
use some set of inputs to test the functionality. Postive
is something which you can test within a range but negative
is mostly limitless.

Apart from this Error guessing is also a very good way to
perform the testing. where a tester uses his skills of
sniffing for functionality failure (again a negative
testing), experience to find the bugs, adhoc testing to
find bugs etc.

Cheers
Harry

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