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Boundary value analysis testing includes the default values testing along with some more positive values. I will better explain this with example.
Say, there is a report which have a textbox for percentage value to be inserted to generate the report on web. Now default value for this textbox is 10. User can insert any value like 0,10,35,100, etc.
Now the warning for this text box is user should not enter any negative value, any text value, any alpha numeric value or more than 4 digit value.
So your boundary value analysis test case for the values like 0,9,10,11,100,9999
Your negative test case will have -1, 10000,abc, ab#, 12#, 12ab, etc
Please let me know if this was helpful.
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Thanks Megha for the simple explanation with an example.
Kindly find attachment:
Thanks Ajay for the Doc on the testing concepts
Boundary value analysis:
This technique is used to identify errors at boundaries rather than finding those exist in center of input domain.
Test cases for input box accepting numbers between 1 and 500 using Boundary value analysis:
a) Test cases with test data exactly as the input boundaries of input domain i.e. values 1 and 500 in our case.
b) Test data with values just below the extreme edges of input domains i.e. values 0 and 499.
c) Test data with values just above the extreme edges of input domain i.e. values 2 and 501.