Testing values of a JSON file with Rspec

Question

I'm using Packer to create AMIs with baked in services. I know I can test the end product using serverspec, but I have a number of naming and tagging standards I'd like to enforce before the AMI is created. Such as version, OS, name etc. These values are held in a JSON file which is fed into packer during image creation.

My question is, is there a way to test/ pass in these values to Rspec and then use regex matcher to validate them. For example if I had in my variables.json

{"version: "0.1.0", "region": "eu-west-1"}

How could I check it using Rspecs regex matcher like

expect(region).to match(/^[a-z]{2}-[a-z]+-[0-9]$/)

what does not work with the example you posted?

Kris
– Kris

2017-07-05 14:37:55 +00:00
Commented Jul 5, 2017 at 14:37 — Kris
– Kris, Commented Jul 5, 2017 at 14:37

Alex Fortuna · Accepted Answer · 2017-07-05 14:45:05Z

1

I test such things by parsing JSON and then using the mighty include against resulting hashes. E.g. try this packed_json_spec.rb:

require "json"

describe "packed JSON data" do
  let(:input) {'{"version" : "0.1.0", "region" : "eu-west-1"}'}
  it "is valid" do
    h = JSON.parse(input)
    expect(h).to include("version" => match(/^\d+\.\d+\.\d+$/))
    expect(h).to include("region" => match(/^eu-\w+-\d+$/))
  end
end

Notes:

Don't forget that RSpec is still Ruby.
JSON means structure. So validity tests should cover structure as well as individual values.

Hope that was helpful. Cheers!

answered Jul 5, 2017 at 14:45

Alex Fortuna

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