[X-Guardian]

Related issue

• Fixes tests: lint Jest tests with eslint-plugin-jest #576

Description

This PR adds eslint-plugin-jest as a root dev dependency and applies its flat/recommended config to **/*.test.ts in the shared eslint.config.mjs.

Package configs register their own test wrappers with the plugin:

• cdktn: the testIf* aliases from test/helper/capabilities.ts count as test blocks for no-standalone-expect.
• provider-generator: onTf1_6AndNewer in module-generator.test.ts becomes a cond ? test : test.skip alias, and counts as a test block. The gated test's title states the Terraform >= 1.6.0 requirement.
• cli-core: waitFor counts as an assertion for expect-expect.
• commons: the Linux-only exec() timeout table in util.test.ts runs through an itOnLinux alias, and itOnLinux.each counts as a test block.

Test changes:

• cli-core/src/test/models/deploy-machine.test.ts: the done-callback tests await xstate's waitFor instead.
• dependency-manager.test.ts and prebuilt-providers.test.ts check for unused registry mocks in afterEach with undici's assertNoPendingInterceptors().
• Conditional expect calls become unconditional:
  • watch.test.ts splits its failure and abort cases into two tests.
  • telemetry.test.ts splits its attribute table into forwarded and omitted cases, and its gating test asserts the exact list of emitted metric names.
  • error-reporting.test.ts and init.test.ts assert on computed values.
• cdktn/test/terraform-hcl-module.test.ts asserts the duplicate-alias error with toThrow.
• cdktn/test/app.test.ts:
  • The cross-stack complex-list test matches the remote state reference and the output name in one stringMatching.
  • An exact duplicate of the remote-backend test is removed.
  • The second CDKTF_CONTEXT test is renamed for what it checks: CDKTF_CONTEXT takes precedence over app context.
• cdktn/test/provider-functions.test.ts drops a test that duplicated the preceding one with a weaker assertion.
• empty-provider-resources.test.ts asserts on the generated files.
• Test files no longer export helpers; commons/src/config.test.ts drops an unused one.
• Five titles lose stray spaces.
• hcl2cdk/test/convertProject.test.ts keeps its describe.skip with a disable comment pointing at test(hcl2cdk): convertProject fixture uses a module with a removed Terraform language experiment #461.

Checklist

• I have updated the PR title to match CDKTN's style guide
• I have run the linter on my code locally
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation if applicable
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works if applicable
• New and existing unit tests pass locally with my changes

[jsteinich]

Could you drop packages/@cdktn/cli-core/.prettierignore2 from the PR? It came in with 879c7a3 and looks like a stray local file:

• Prettier only reads .prettierignore (plus .gitignore, or whatever --ignore-path names), and nothing in the repo points it at .prettierignore2, so the file has no effect. With Prettier 3.9.6, a pattern in .prettierignore2 doesn't ignore a matching file; the same pattern in .prettierignore does.
• It's an older copy of the root .prettierignore. It still has entries main has since dropped (packages/cdktf-cli/templates/*/cdktf.json and the three !tools/... negations), and it's missing tools/generate-function-bindings/function-availability/.

[X-Guardian]

Oops, done.