For a while now, we've had an internal lint rule for test formatting which enforces things like "a template string must be either indented 0 or indented template indent + 2" and "all cases must be prettier formatted" (https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin-internal/src/rules/plugin-test-formatting.ts). This is really useful for keeping rule test code clean and readable.

This also isn't really specific to typescript-eslint. I could see a use case for any arbitrary plugin to want it.

Proposal: let's either...

• Preferred: contribute this to https://github.com/eslint-community/eslint-plugin-eslint-plugin, the standard plugin for linting ESLint plugins
  • Add a rule to enforce test code cases are auto-formatted eslint-community/eslint-plugin-eslint-plugin#486
• Fallback: if they don't want it there, publish this as our own standalone thing

This issue sparked by @bradzacher's comment in a Discord #help thread on RuleTester usage around suggestions: https://discord.com/channels/1026804805894672454/1263283955671629914/1263373794836484207

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