This reminds me of the old saying that ‘a little knowledge is a dangerous thing’.
I tried the online test and it had me down as mildly depressed. The thing is context is important. Many of my answers were probably because of the Summer heat. I live in Cyprus in the Mediterranean, where summer day time temperatures are 30-40 degrees Celsius and I try not to use aircon.
Give it a try and form your own opinion. Here’s the link to further information on the test.