GLSP-1635: Migrate test framework from Mocha to Vitest

[tortmayr]

What it does

Replaces the Mocha/Chai/nyc/Sinon test stack with Vitest.

• Consume the @eclipse-glsp/dev next packages, drop .mocharc/.nycrc, and point all test scripts at vitest run
• Drive the whole monorepo from a single flat Vitest config at the repo root instead of per-package configs, yielding one merged coverage report
• Type-check specs separately via composite tsconfig.test.json projects, since Vitest only transpiles; wire them through a compile:test step so pnpm test type-checks specs before running them
• Import the test API explicitly in every spec (no ambient globals) and load reflect-metadata once via root setup files for the DI specs
• Replace the custom expectToThrowAsync helper with Vitest's native rejects.toThrow() / toThrow() matchers and drop the obsolete test-util module
• Keep test-only code out of the published packages by excluding specs and test/ helper directories from both the build and the packed files
• Switch CI and contributor docs to Vitest: run pnpm test, and remove the now-obsolete test-report step and the redundant per-package and :ci test scripts
• Clean up leftover tooling artifacts: ignore *.tsbuildinfo so the new per-config build-info is covered, and drop the obsolete nyc/CTRF ignores and clean targets
• Run the workflow-standalone example's TS scripts via Node's native type stripping instead of ts-node (which the Mocha toolchain used to provide transitively): convert the scripts to ESM (.mts), drop the ts-node dependency, and raise the Node engine floor to 22.18 where stripping is unflagged

Also:

• Fix indentation in the local /fix skill doc

Part of: eclipse-glsp/glsp#1635

How to test

pnpm install
pnpm test
pnpm build

• pnpm test type-checks the specs (compile:test) and runs the full suite under Vitest — 53 test files / 823 tests pass (~2.3s)
• Spec type-checking is active: a deliberate type error in a spec fails pnpm compile:test
• pnpm build succeeds with no ts-node installed (workspace or global) — the example's .mts scripts run under Node's native type stripping
• pnpm test:coverage produces the merged coverage report

Follow-ups

None.

Changelog

• This PR should be mentioned in the changelog
• This PR introduces a breaking change (if yes, provide more details below for the changelog and the migration guide)

[github-actions]

Preview: Removed (PR closed).

[Copilot]

Pull request overview

Migrate the monorepo’s test stack from Mocha/Chai/nyc/Sinon to Vitest, centralizing configuration and coverage, updating test sources to the Vitest API, and adjusting tooling/CI/scripts (including the workflow-standalone example) to run without ts-node.

Changes:

• Introduce a single root Vitest/Vite config and new composite tsconfig.test.json projects wired through pnpm compile:test.
• Update protocol/client specs to use Vitest assertions/mocks/timers and remove obsolete Mocha/nyc configs and helpers.
• Update CI, VS Code launch configs, and workflow-standalone scripts to run under Node’s native TypeScript stripping (Node >= 22.18).

Reviewed changes

Copilot reviewed 77 out of 81 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
vite.config.ts	Adds a flat root Vitest/Vite config for monorepo-wide test/coverage behavior.
tsconfig.test.json	Adds root composite TS project for type-checking tests across packages.
tsconfig.json	Switches root TS config base away from the Mocha-specific preset.
tsconfig.eslint.json	Ensures root Vitest config is included in ESLint TS project.
pnpm-workspace.yaml	Updates hoisting patterns and override comments for the new test toolchain.
packages/protocol/tsconfig.test.json	Adds protocol test-only composite TS config.
packages/protocol/tsconfig.json	Excludes tests from protocol build outputs.
packages/protocol/src/utils/uuid.spec.ts	Migrates UUID tests from Chai to Vitest.
packages/protocol/src/utils/test-util.ts	Removes obsolete Mocha/Chai async-throw helper utilities.
packages/protocol/src/utils/geometry-vector.spec.ts	Migrates vector tests from Chai to Vitest.
packages/protocol/src/utils/geometry-movement.spec.ts	Migrates movement tests from Chai to Vitest.
packages/protocol/src/utils/function-util.spec.ts	Migrates debounce tests from Sinon fake timers to Vitest timers/mocks.
packages/protocol/src/utils/event.spec.ts	Migrates event tests from Sinon/Chai to Vitest.
packages/protocol/src/utils/disposable.spec.ts	Migrates disposable tests from Sinon/Chai to Vitest spies/assertions.
packages/protocol/src/utils/array-util.spec.ts	Migrates array util tests from Chai to Vitest.
packages/protocol/src/sprotty-geometry-point.spec.ts	Migrates point tests from Chai to Vitest.
packages/protocol/src/sprotty-geometry-dimension.spec.ts	Migrates dimension tests from Chai to Vitest.
packages/protocol/src/di/lazy-injector.spec.ts	Migrates DI tests from Chai to Vitest.
packages/protocol/src/di/feature-module.spec.ts	Migrates DI feature-module tests from Chai to Vitest.
packages/protocol/src/di/container-configuration.spec.ts	Migrates container configuration tests from Chai to Vitest.
packages/protocol/src/action-protocol/viewport.spec.ts	Migrates viewport action tests from Chai to Vitest.
packages/protocol/src/action-protocol/undo-redo.spec.ts	Migrates undo/redo tests from Chai to Vitest.
packages/protocol/src/action-protocol/tool-palette.spec.ts	Migrates tool palette tests from Chai to Vitest.
packages/protocol/src/action-protocol/node-modification.spec.ts	Migrates node modification tests from Chai to Vitest.
packages/protocol/src/action-protocol/model-saving.spec.ts	Migrates model saving tests from Chai to Vitest.
packages/protocol/src/action-protocol/model-layout.spec.ts	Migrates model layout tests from Chai to Vitest.
packages/protocol/src/action-protocol/model-edit-mode.spec.ts	Migrates edit mode tests from Chai to Vitest.
packages/protocol/src/action-protocol/model-data.spec.ts	Migrates model data tests from Chai to Vitest and fixes nested it structure.
packages/protocol/src/action-protocol/element-validation.spec.ts	Migrates validation tests from Chai to Vitest and fixes nested it structure.
packages/protocol/src/action-protocol/element-type-hints.spec.ts	Migrates type-hints tests from Chai to Vitest.
packages/protocol/src/action-protocol/element-text-editing.spec.ts	Migrates text-editing tests from Chai to Vitest.
packages/protocol/src/action-protocol/element-selection.spec.ts	Migrates selection tests from Chai to Vitest.
packages/protocol/src/action-protocol/element-navigation.spec.ts	Migrates navigation tests from Chai to Vitest.
packages/protocol/src/action-protocol/element-hover.spec.ts	Migrates hover tests from Chai to Vitest.
packages/protocol/src/action-protocol/element-creation.spec.ts	Migrates creation tests from Chai to Vitest.
packages/protocol/src/action-protocol/edge-modification.spec.ts	Migrates edge modification tests from Chai to Vitest.
packages/protocol/src/action-protocol/contexts.spec.ts	Migrates contexts tests from Chai to Vitest.
packages/protocol/src/action-protocol/clipboard.spec.ts	Migrates clipboard tests from Chai to Vitest.
packages/protocol/src/action-protocol/client-notification.spec.ts	Migrates client notification tests from Chai to Vitest.
packages/protocol/src/action-protocol/base-protocol.spec.ts	Migrates base protocol tests from Chai to Vitest.
packages/protocol/package.json	Removes Mocha/nyc scripts and excludes test assets from packed files.
packages/client/tsconfig.test.json	Adds client test-only composite TS config.
packages/client/tsconfig.json	Excludes tests from client build outputs.
packages/client/src/utils/gmodel-util.spec.ts	Migrates gmodel util tests from Chai to Vitest.
packages/client/src/features/validation/marker-navigator.spec.ts	Migrates marker navigator tests from Mocha/Chai to Vitest.
packages/client/src/features/tools/marquee-selection/marquee-behavior.spec.ts	Migrates marquee behavior tests from Chai to Vitest.
packages/client/src/features/test/layouter-test-util.ts	Removes Mocha dependency and fixes import path for layouter test util.
packages/client/src/features/routing/sticky-manhattan-edge-router.spec.ts	Migrates routing tests from Chai to Vitest.
packages/client/src/features/navigation/navigation-target-resolver.spec.ts	Migrates navigation resolver tests from Mocha/Chai to Vitest.
packages/client/src/features/layout/layout-elements-action.spec.ts	Migrates layout tests to Vitest and removes Sinon usage.
packages/client/src/features/grid/grid-snapper.spec.ts	Migrates grid snapper tests from Chai to Vitest.
packages/client/src/features/change-bounds/point-position-updater.spec.ts	Migrates point position updater tests from Chai to Vitest.
packages/client/src/features/bounds/vbox-layout.spec.ts	Migrates VBox layouter tests to Vitest and uses shared test util module.
packages/client/src/features/bounds/hbox-layout.spec.ts	Migrates HBox layouter tests to Vitest and uses shared test util module.
packages/client/src/features/bounds/freeform-layout.spec.ts	Migrates FreeForm layouter tests to Vitest and uses shared test util module.
packages/client/src/default-modules.spec.ts	Migrates default-modules tests to Vitest and updates spying approach.
packages/client/src/base/selection-service.spec.ts	Migrates selection service tests from Chai/Sinon to Vitest mocks/assertions.
packages/client/src/base/model/model-initialization-constraint.spec.ts	Migrates model initialization constraint tests from Sinon/Chai to Vitest.
packages/client/src/base/model/glsp-model-source.ts	Converts an import to type-only to avoid runtime coupling.
packages/client/src/base/feedback/feedback-emitter.spec.ts	Migrates feedback emitter tests from Chai to Vitest.
packages/client/src/base/action-dispatcher.spec.ts	Migrates action dispatcher tests from Chai to Vitest.
packages/client/package.json	Removes Mocha/nyc scripts and excludes tests from packed files.
package.json	Replaces test scripts with Vitest + compile:test, updates Node engine floor, and removes obsolete deps.
examples/workflow-standalone/scripts/start.mts	Switches workflow-standalone scripts to .mts and updates imports for ESM/stripping.
examples/workflow-standalone/scripts/start-node-server.mts	Switches workflow-standalone server launcher to .mts and updates imports.
examples/workflow-standalone/scripts/download-server.mts	Updates download helper for ESM/JSON import attributes and non-require.main entry detection.
examples/workflow-standalone/package.json	Updates scripts to run via node (no ts-node).
CLAUDE.md	Updates documented test command(s) to Vitest.
AGENTS.md	Updates documented test command(s) to Vitest.
.vscode/launch.json	Replaces Mocha-based debug launchers with Vitest launchers.
.nycrc	Removes obsolete nyc configuration.
.mocharc	Removes obsolete Mocha configuration.
.gitignore	Removes nyc/CTRF artifacts and broadens tsbuildinfo ignores.
.github/workflows/ci.yml	Updates CI to run pnpm test/pnpm test:coverage under Vitest and drops CTRF reporting step.
.claude/skills/fix/SKILL.md	Fixes indentation in the /fix skill documentation.

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[Copilot]

Pull request overview

Copilot reviewed 77 out of 81 changed files in this pull request and generated 1 comment.