Add Terraform support

[bew]

Closes #176

I tried to add tests but have hit a few roadblocks:

1. When I try to run the tests (for all langs or just for terraform) the test runner seems to hang after outputing a few Scheduling: path/to/..._spec.lua lines (I tried on MacOS for now)
2. I don't understand the result data field 🤔
   (also, shouldn't expected be { 3, 7 } for data_for_split in the example?)

[Wansmer]

expected - numbers of rows with the reference version of the node in the desired state for further comparison. result - numbers of rows after execution of the function under test (split/join), i.e. lines that the node will occupy after formatting.
See how tests for any other language are made in the tests directory.

When I try to run the tests (for all langs or just for terraform) the test runner seems to hang after outputing a few Scheduling: path/to/..._spec.lua lines (I tried on MacOS for now)

Try call make preinstall-ts-parsers before run tests

[bew]

When I try to run the tests (for all langs or just for terraform) the test runner seems to hang after outputing a few Scheduling: path/to/..._spec.lua lines (I tried on MacOS for now)

Try call make preinstall-ts-parsers before run tests

Yes sorry should have mentioned, here is a screenshot of what I see..

I tried waiting for the tests to start, but it seems it auto-stopped after 50sec 🤔

---

See how tests for any other language are made in the tests directory.

Well I tried to understand some simple ones like the Nix ones but I was still lost..

I actually finally understood what was going on by looking at the tu._test_format function.. 😅
Making all the tests now, I'm using this field mapping in my head:

• result_range for result
• compare_to_range for expected

and flipping the order of result and expected in the test data, because it reads better to me like text in result_range should equal text in compare_to_range.
(if you're interested into different names/wording ¯\_(ツ)_/¯)

[bew]

Wasn't able to run the tests locally, but from my understanding the test data should be okay 🤔

[Wansmer]

I've fixed the tests. It's strange that they didn't run locally. I'm using macos too - everything works.
Thanks for the PR!

[bew]

Ah I missed the 0-based rows ^^'
Thanks!