add test to verify the YAML file

[ejhumphrey]

tests should verify that

• the yaml can be read
• all URLs don't return a 400+?

maybe other things?

[faroit]

I will try to find some time for this. I would do it in py.test, ok?

[ejhumphrey]

❤️ pytest! We've already got the requirements file, so a test_database.py or equivalent will be 👌

I'm realizing that there are actually two things to be done here – add the test file to verify the yaml is valid, and then (later) actually setting this up in a CI/CD framework, e.g. Travis, circle-ci, etc. I'll update this issue to be only the former, and create a new issue for the CI/CD thing specifically, which is a heavier (and subsequent) lift.

[faroit]

Started in #8, it also integrates CI, hence #7.

all URLs don't return a 400+?

I check for 200, is this too strict?

[stefan-balke]

Integrated.