[openstreetmap/openstreetmap-website] WIP: Reduce use of Selenium in favour of rack-test (PR #6497)

[Andy Allan]

gravitystorm left a comment (openstreetmap/openstreetmap-website#6497)

> So it sounds like this is a solution to that but with the downside that you're really testing how the site will behave in a browser any more.

I have the "behave like a browser" split into two aspects in my mind:
* With regards to the manner that the tests are written in, I prefer "click_on link, fill_in foo, click submit" as more closely mimicking what a user is doing. The alternative is "assert page has_link(foo), get foo, assert_dom has_input_field, post bar" and I find that more fragile and generally less like mimicking the user experience. So that's in favour of the system test syntax.
* Then when it comes to the manner the tests are run, I'd love to just push everything through a real (albeit headless) browser, but for practical reasons it can be painfully slow. I console (delude?) myself that using e.g. rack-test (or similar) is like "using the site with javascript disabled". It's not ideal, but I haven't come across many actual problems with doing that.

I live in hope that someone can create something that's much closer to a real browser, in terms of layout engines and js execution, without having to actually be an entire browser and all the headaches that brings.


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