Yes, that's exactly the case, mentioned in [this comment](https://github.com/sympy/sympy/pull/2942#issuecomment-35746553):
```
$ fgrep -R __eq__ sympy/functions/
$ fgrep -R __ne__ sympy/functions/
$
```

@smichr, I think you should reopen this pr and keep at least hese changes.  BTW, I think we can remove these tests.