[cgmorton]

Everyone who is getting angry, listen:

This isn't a test for suitability for the position. It's a matter of signalling.

This is a cheap test (surely can't take more than 5 minutes to complete a grammar test), but with the property that the only candidates who will -fail- it are candidates unsuitable for hiring. Since the author gives no statistics, we can only assume that enough people are weeded out to make it worthwhile.

It's much the same as a FizzBuzz test. I certainly don't feel offended if I'm given such a test at an interview, I just smile and do it.