Date: Thu, 30 Nov 2000 10:02:54 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: anthony <anthony AT antman DOT force9 DOT co DOT uk>
cc: djgpp AT delorie DOT com
Subject: Re: white box testing in c
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On Wed, 29 Nov 2000, anthony wrote:

> does anyone know how to white box test?

AFAIK, that's when you study the sources of a program, and then design a 
test case for each of the possible instance of control flow that it could 
take.

For example, for each if-then-else clause, you need a test case that 
satisfies the condition and exercises the `then' block, and another test 
case which exercises the `else' block.

There are tools which report source coverage when you run a test case: 
they tell you which source lines were executed during the run and which 
weren't.  After running tests, you are supposed to demonstrate that 
you've covered a certain percentage of the source lines, as close to 100% 
as possible.