testing - boundary analysis test case on string match algorithm -


in software testing, boundary value analysis intuitive numerical input, when try boundary analysis on string match algorithms (e.g boyer moore), find hard boundary analysis , derive test cases it.

for numerical boudary, e.g. x input , x>=100. boundary value 100 example

boundary: x>=100 on point: x=100 off point: x=101

but consider string matching, have 2 equivalent classes: 

ec1: length(pattern) = length(text), pattern occurs in text.   ec2: length(pattern) = length(text), pattern occurs not in text.

ec1 should return match(which 0), , ec2 should return -1.but boundary values hard determine cos not numerical boundary, can say: 

boundary: pattern occurs in text. on point: pattern occurs in text.  off point: pattern not occur in text

thanks in advance


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