Code coverage helps, but it's not enough

kinow @ Jan 25, 2011 19:41:59

Today I talked to two QA Engineers about code coverage and we all agreed that code coverage helps, but is not enough. And by coincidence today I had to fix a bug in tap4j that reminded me the same thing. My cobertura (the coverage tool that I was using at moment) report said that my code was covered by my tests. However there was a bug in the covered code.

Cobertura code coverage

If you are curious about the code you can see this issue here. However if you really would like to know more about code coverage, I suggest you to read this fantastic article written by Brian Marick in 99 with the title “How to misuse code coverage”.

I will finish this post now quoting him:

“they (code coverage tools) are only helpful if they’re used to enhance thought, not to replace it”.

Cheers :-)