[DIT-12085] Add tests for JSONFormatter and account for pluralForm

[bparrish17]

Overview

• Adds test suite for JSONFormatter class

Context

DIT-12085: CLI: Update default JSON formatter to write plurals to JSON files

Test Plan

Setup

1. Make sure you have a .env with the following content:

DEBUG=true
DITTO_API_HOST=http://localhost:3001

2. 🚨 Make sure you're working off of the backend branch with the relevant API changes

3. Have a basic config set up, e.g.

projects:
  - id: <project-with-plurals>
variants:
  - id: base
  - id: spanish
  - id: japanese
components:
  folders:
    - id: root
outputs:
  - format: json
     framework: i18next

4. Run yarn sync at the root of the CLI directory, this should pull from your local Ditto environment

• Text Items without plurals are written to the correct json files without any developer id suffix
• Text items with plurals are written with their respective plural form appended with an underscore to the end of their developer id json key, e.g. my-developer-id_many
• Plural'd text item values match plural text value and not base text value, including variables
• Components without plurals are written to the correct json files without any developer id suffix
• Components with plurals are written with their respective plural form appended with an underscore to the end of their developer id json key, e.g. my-developer-id_many
• Plural'd component values match plural text value and not base text value, including variables
• Confirm that textItems and components with variant plurals are also written correctly to their respective ___variant json file

[marla-hoggard]

Looks good! Just a couple nits.

This relies on changes from the API which are also still open in a PR, so we'll need to wait for that one to deploy before publishing this to NPM. We could merge this without publishing, but probably safest to wait and do it all at once.

[marla-hoggard]

Suggested change

	id: "text1",
	id: "text1_one",

[marla-hoggard]

Nit: Can we remove nullable() from here so that ZTextPluralType is enum, and instead apply nullable() on line 38? That's consistent with the typing in the main app.