feat: migrate test suite from Mocha to Vitest#2815

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aewing wants to merge 43 commits intosveltejs:masterfrom

aewing:feat/migrate-mocha-to-vitest

Commits on Aug 7, 2025

Commits on Aug 14, 2025

test(language-server): revert Vitest snapshots to file-based expectedv2.json for inlayHints and folding-range; keep Vitest runner
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test(language-server): add/update expectedv2.json snapshots for inlayHints and folding-range
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test(language-server): switch Diagnostics tests to expectedv2.json file-based snapshots; remove Vitest snapshot usage
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test(language-server): restore all expectedv2.json from git history where available; convert diagnostics snapshots to expectedv2.json
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test(language-server): accept both Svelte 4 (hyphen) and Svelte 5 (underscore) diagnostic codes in SveltePlugin tests
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test(language-server): remove obsolete snapshot artifact directories (__snapshots__ and diagnostics/fixtures/snapshots)
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test(language-server): tolerate Svelte 4 vs 5 diagnostic differences (message + range.start) in SveltePlugin tests
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test(language-server): update expectedv2.json snapshots across diagnostics, inlayHints, and folding-range
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chore: align pnpm-lock.yaml with package.json resolutions (Svelte 4)
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merge: upstream/master into feat/migrate-mocha-to-vitest (resolve pnpm-lock via pnpm install)
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test(language-server): align inlayHints workspace to fixtures and restore expectedv2.json with <workspaceUri> placeholders from upstream
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fix: svelte5 inlayHints snapshot
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fix: correct test assertion syntax and TypeScript errors in vitest migration
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fix: add .sequential to resource-intensive test suites to prevent intermittent failures
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fix: resolve CI test failures for cross-platform compatibility
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style: format diagnostics test file with prettier
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feat: add Svelte version switching and testing scripts
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fix: update Svelte version switching to use pnpm overrides
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fix: handle .v5 tests properly in inlayHints
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chore: lint fixes
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fix: add cleanup to version switching script
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fix: remove version switching scripts
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fix: formatting and lockfile
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fix: update test snapshots for TypeScript union type ordering changes
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fix: restore deleted tsconfig.json and package.json test fixtures
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Commits on Aug 17, 2025

fix: diagnostics feature workspace dir
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