feat: Assert json content

[jakub-bochenski]

No tests added, I don't have time ATM, I made sure it works by using it.

Still maybe it will be useful to somebody

[Wuodan]

This would add jq as dependency.

[jakub-bochenski]

Yes, but only needed if you actually use the assert_json statement, so it's an optional dependency.

I don't think trying to reimplement something similar in pure bash is a good idea.

The alternative is to publish it as a standalone bats library, but then it's so much less discoverable.

[Wuodan]

I just wanted to point out that jq is a requirement with your change. And that needs consideration and if added some handling - in the docs would be the bare minimum.

An I agree, trying to replace jq here would be a bad idea.

But it adds test/environment surface - I vaguely remember having issues with variants of jq where some "install tool" GH action replaced the runners normal jq (maybe with a pip version) and things were differently with the changed jq version.

Just my 2 cents for the PR.

I like that you are sharing the code - even if not merged, it may be useful to someone!

[martin-schulze-vireso]

I am fine with this as long as:

1. we have good diagnostics (clear errors message) and robust behavior (failing tests) when jq is not there
2. we have tests for this