The Industry standard for compression testing in consumer audio is actually CEA-2034a. Various other standards exist and are in use in the pro audio industry with the primary difference being around the test stimulus used.
We will be publishing something on all of this in the coming months. I'd love to do compression testing on all speakers that come for review but there are potential risks of harm and we don't feel comfortable asking manufacturers to allow us to do that. It also brings new demands on our testing that may not be feasable. Things like sufficiently large and powerful amplifiers and an ability to play annoying tones at really loud levels for extended periods of time outside. My neighbors are likely already at their limits. I can't get far enough out into a field to totally address this problem. Still you never know, we might start doing this on some products.