Object Mentor Blog: The Quality of TDD

The Quality of TDD

Uncle Bob — Sat, 16 Feb 2008 20:23:44 -0600

Kieth Braithwaite has made an interesting observation here. The basic idea is that code that has been written with TDD has a lower Cyclomatic Complexity per function compared to code that has not been written with TDD. If this is true then it could imply lower defects because of this.

Kieth’s metric takes in the code for an entire project and boils it down to a single number. His hypothesis is that a system written with TDD will always measure above a certain threshold, indicating very low CC; whereas systems written without TDD may or may not measure above that threshold.

Kieth has built a tool that you can get here that will generate this metric for most java projects. He and others have used this tool to measure many different systems. So far the hypothesis seems to hold water.

The metric can’t tell you if TDD was used; but it might just be able to tell you that it wasn’t used.

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Now each property has a getter and a setter with CC of 1, which results in a higher number of bean classes whose CC values sum up to something around 11. I’m pretty sure the function would be monotone increasing if these classes would have been excluded.

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