Ensure Source Code Coverage During Testing
A series of test scripts should, of course, run every single line of code in your application. Every time you have an If statement, or a Select Case statement, the number of possible execution paths increases rapidly. This is another reason why it's so important to write test code at the same time as the "real" code-it's the only way you'll be able to keep up with every new execution path.
The Visual Basic Code Profiler (VBCP) add-in that shipped with Visual Basic 5 is able to report the number of times each line of code is executed in a run. Using VBCP while testing your code will allow you to see which lines have been executed zero times, enabling you to quickly figure out which execution paths have no coverage at all.