[nahname]

>TDD is huge in Java and Ruby ...40-50% ...JavaScript’s percentage of projects using a testing framework is considerably lower, coming in at 25%.

I doubt it is even that high. Sadly, many of the JS projects I look at have a tests folder and one test in it that usually amounts to:

equal("tests written", false)

[litmus]

I think the conclusion for Java is a stretch as well. Some sort of unit testing is probably standard in BigCo, TDD is not (I'm excluding the 'hot' trend-setting BigCos obviously).