Test Segment tracking after user creation

[vidmantas]

Tries to implement segment tracking testing requested in #350

Used some ideas from http://blog.plataformatec.com.br/2015/10/mocks-and-explicit-contracts/

I don't think that message sending to self is useful in development, so I've created a separate implementation to be plugged in for testing only.

[joshsmith]

This is fantastic. Good work @vidmantas!

[joshsmith]

Did you want to merge this now or test the other calls in the context of this PR? I'd be fine with either.

[begedin]

This is what I imagined we'd have. Great work, @vidmantas

[vidmantas]

I've added a test for another users controller method, however before proceeding with other occurrences of Segment tracking wanted to raise a question on organizing tests:

now we have pretty big chunks of repetitive "setup" part before assertions on some create and update test cases (e.g. when valid data is passed, lines 75-83, 95-102) . Let's try to organize them using named setups? If you want, I can provide a separate PR as a suggestion (in this case I think it would make sense to merge this one and continue for the rest of Segment calls as separate PR after there's decision on this question)

[begedin]

@vidmantas We already had a few attempts at reducing test boilerplate, especially with creating records/payloads, but weren't happy with the results. Feel free to make a PR with your suggestion. I have a feeling it will be well received.

As for this, we can consider it ready, so squash/rebase and merge when you get the chance. If you also don't mind, keep the referrenced issue open and add a comment saying what else is needed (as in "the infrastructure for this has been merged, now it's just a matter of writing the individual tests."), with maybe links to the relevant code.

[joshsmith]

@vidmantas I second what @begedin said!

[vidmantas]

@begedin @joshsmith alright. I just don't have write access to merge, so please do that instead of me and I'll proceed as discussed ;)

[joshsmith]

Can you squash? Then we can merge.

[vidmantas]

@joshsmith ah, right, sorry. Done now :)

[joshsmith]

🙌 !