Use same docker image versions for tests

[Steveb-p]

I'm sitting here with a very, very bad internet connection and without docker images preloaded on my laptop (I'm using a different one that usually) and I've noticed that there are two different versions of MongoDB service being pulled - one 3.4 and second 3.4.0. The same goes for alpine, but considering it's a lot smaller...

Anyway, I think we should use the same images in all tests?

EDIT: Also preferably we could use smaller "service" image instead of Mongo? Like nginx:alpine? (150 MB~ish worth of docker layers would become around 7 MB?)

[AlexZeitler]

As can be seen in #45 3.4 broke the tests.
Using nginx:alpine would be fine but we need to make the start blocking then.

[Steveb-p]

I'd say we should pin to a specific version anyway to prevent such random test failures :)

Assertion in the test in question can also be "rephrased" to check for something else than OS name :) It is a test of docker-compose exec anyway :)

[AlexZeitler]

👍

[AlexZeitler]

The entry for nginx:alpine in docker-compose should contain this to be blocking:

command: nginx -g "daemon off"

[Steveb-p]

@AlexZeitler I'll provide PR in the evening. Had a few days off due to holidays & being busy at work.

[AlexZeitler]

👍 Take your time

[Steveb-p]

Intentionally left Nginx with Debian as OS for your checkOS tests.

Also, is there any particular reason for tape as test framework? I'm not really familiar with it, but it doesn't seem to be "vocal" about which tests exactly did not pass and it's kinda a hurdle to look through output to see :) Not to mention not really being able to filter tests to only run those I'm interested in (I didn't really look too much into it, just curious).