Fix tests and example [list-ops]

[srabuini]

Hey,

I've found a couple of inconsistencies here. Some assert should be assert_equal, and fixing that, I've realized that some tests doesn't pass anymore. So I'm proposing those changes.

Please have a look and let me know.

Thanks!

[Cohen-Carlisle]

That stuff was definitely pretty broken 😨
Thanks, @srabuini, these changes look good to me.

[Insti]

Who merged this? Oh, it was me 😢
Why did I do that? I was cleaning up abandoned pull requests, and this one looked like it had enough work on it that just rejecting it would be a waste.

I wrote:

Does anyone want to address the issues raised by @bernardoamc's last review?
If not I suggest we should just merge it and have a less-than-perfect problem out there for people to try and then suggest improvements to.

Wow, this turned out to be more broken than I expected, but at least my plan worked. Many thanks @srabuini

[Insti]

Merging this now due to the brokenness of the original version.
Any tweaks needed can be made in another PR.