add SimpleCov

[markets]

💎 https://github.com/colszowka/simplecov

Very useful 👌 as stated by @sauloperez in #281. I think we can configure Travis with Code Climate later.

After running the tests, you can open the generated PROJECT_ROOT/coverage/index.html file in a browser and you can see a detailed coverage report ✨

At this point 62.58% covered.

[markets]

Current build failed on Travis, but it seems totally unrelated to this PR.

All feature (capybara) specs failed, with same error: Net::ReadTimeout. I'd say this is something related to the ChromeDriver installation (or the add-on in Travis)... I see other branches failing with same error (I just rebased #421 and suite is failing with same error), so we'll need to take a look to this point.

[enricostano]

I'd say this is something related to the ChromeDriver installation

@Morantron KEASECHO

[markets]

@Morantron @enricostano I started a branch to try fix this 👉 #461

First of all, I just upgraded gems to latest versions (basically because the chromedriver gem https://github.com/flavorjones/chromedriver-helper#known-issues has kwown issues with our current version), let's see what Travis says (it passes ✔️ for me in my local env)

[markets]

@sauloperez friendly ping 😸

[sauloperez]

[sauloperez]

At this point 62.58% covered.

Not bad

[enricostano]

@markets @sauloperez are we going to add coverage check in CI?

[sauloperez]

We should. Otherwise, coverage is not that useful.

[enricostano]

I created an issue for that #476