There have only been 3 major releases with known backwards-incompatible changes. The reason you would want to test your code in so many versions of Node would b

There have only been 3 major releases with known backwards-incompatible changes. The reason you would want to test your code in so many versions of Node would be to check that you aren't depending on newer features that aren't in older versions that you want to still support. Testing across 32 versions is probably very overkill for most people though.