This module actually does something

Provided the patch to remove the help page hook as defined in nothing.module

Don't we need a test to see if this module really doesn't do anything?

This should be critical for sure

I think testing nothing with nothing would be the best solution here.

Do we need nothing.module file? I think that in Drupal 8 .info.yml should be all we need.

The defined "This module never will do nothing" is a double negative.

In standard English, two negatives cancel each other out, so this module description is actually saying it will do something.

Actually I believe

"This module never will do nothing"

The module description here is saying in no case, never, will the module do nothing.

But since the only hook this module is implementing, hook_help, is provided by the help module if the help module is not enabled this module will do nothing.

So in the case that help module is not enabled this module will do nothing. So hardly "never"

Furthermore a site could have the help module enabled but the route help.page could be altered in any number of ways to not do anything if the route argument {name} equals "nothing". So this case the module would also do nothing.

You could even argue that on most sites nobody ever goes to the /admin/help path so nobody would ever see the "Nothing" link to look on at the message. So in that case since this modules message was never printed on the screen the module never does anything.