This one is much much better: http://ortask.com/a-better-way-to-hire-developers-and-tester...

Another approach: http://ortask.com/a-better-way-to-hire-developers-and-tester...

There is a tool to detect duplicate tests which many have found useful: http://ortask.com/testless/

For other kinds of test quality, try Mutator: http://ortask.com/mutator/

Thanks for the links!

I hate to sound negative, but something about that website seems dodgy. I'm unconvinced duplicate/overlapping tests -- while obviously undesirable -- have a direct correlation with code quality. Unfortunately, in order to read their "papers" where they elaborate on this, I have to register :/

I'd rather use something open source like pitest.

(Again, thanks for the links! I don't want to sound too negative)

There are also other great mutation testing tools for other languages, such as Mutator: http://ortask.com/mutator/