Add comprehensive test infrastructure with 230 tests and Node 22/24 + Yarn v4 compatibility

[Copilot]

Implements test infrastructure from scratch for the react-obj-view library, addressing the complete absence of automated testing, and ensures compatibility with modern Node.js and Yarn versions.

Testing Framework

• Vitest with React support and happy-dom environment
• Test scripts: test, test:watch, test:ui, test:coverage
• Coverage reporting with v8 provider

Test Coverage (230 tests, 12 files)

Utilities (26 tests)

• joinClasses: class name concatenation, falsy filtering
• object: property access, getters, error handling
• groupedProxy: factory creation, caching, equality checks

Core Engine (116 tests)

• CircularChecking: circular reference detection with WeakSet, LIFO stack management, deep nesting support
• StateFactory: state creation and caching, child state management, nested hierarchies, read-only access
• getObjectUniqueId: unique ID generation with WeakMap, object identity tracking, performance tested with 1000+ objects
• walkingToIndexFactory: tree walking and indexing, node expansion/collapse, circular reference handling during traversal, state caching, path navigation

Resolvers (40 tests)

• collections: Map/Set/Iterator resolvers in preview and normal modes
• promise: promise status tracking, InternalPromise wrapper
• LazyValueWrapper: instance caching, initialization, getter evaluation

Components (26 tests)

• ObjectView rendering: primitives, objects, arrays, special types (Map, Set, Date, RegExp, Error, Promise)
• Props validation: expandLevel, className, style, lineHeight, preview, showLineNumbers
• Large datasets with grouping (arrayGroupSize, objectGroupSize)

Integration (22 tests)

• Circular references (simple, nested, array, mutual)
• Complex nested structures with mixed collections
• Performance: 10K+ item arrays/objects
• Edge cases: typed arrays, frozen objects, sparse arrays, special numbers (Infinity, NaN)

Node.js & Yarn Compatibility

• Node.js: 22.x and 24.x support with .nvmrc file
• Yarn: 4.x compatibility (configured via packageManager field)
• Engines: Added engines field in package.json requiring Node >=22.0.0 and Yarn >=4.0.0

CI/CD

• New CI Workflow: .github/workflows/ci.yml tests against both Node 22.x and 24.x using Yarn 4
• Updated Deploy Workflow: Uses Node 22 for GitHub Pages deployment
• Security: Explicit permissions set for GitHub Actions workflows

Documentation

• TESTING.md: framework overview, test patterns, debugging, CI/CD integration, prerequisites and setup instructions
• Updated README.md with testing section and system requirements

Original prompt

planning test for this repository and apply it step by step

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[vothanhdat]

how about walkingToIndexFactory and StateFactory @copilot

[Copilot]

how about walkingToIndexFactory and StateFactory @copilot

Added comprehensive tests for both modules in commit 8396c0b:

walkingToIndexFactory (40 tests):

• Tree walking and indexing logic
• Node expansion/collapse
• Circular reference handling during traversal
• State caching and updates
• Path navigation and node retrieval

StateFactory (19 tests):

• State creation and caching
• Child state management
• Nested hierarchies
• Read-only access patterns

Also added tests for supporting modules:

• CircularChecking (27 tests): Reference detection and stack management
• getObjectUniqueId (30 tests): Unique ID generation with WeakMap

Total: 230 tests now passing (up from 114).

[vothanhdat]

@copilot how about yarn v4, node 22, node 24.

[Copilot]

@copilot how about yarn v4, node 22, node 24.

Compatibility added in commit 98fdbfe:

• .nvmrc for local development (Node 22)
• engines in package.json (Node >=22.0.0, Yarn >=4.0.0)
• CI workflow matrix testing Node 22.x and 24.x
• Yarn 4 enabled via Corepack in CI
• Updated README and TESTING.md with prerequisites

All tests and build verified working.

Make it compatible vs yarn v4, node 22, node 24 @copilot

Added full compatibility in commit 98fdbfe:

Node.js Support:

• .nvmrc file specifying Node 22
• engines field in package.json requiring Node >=22.0.0
• CI workflow testing both Node 22.x and 24.x

Yarn v4:

• Already configured via packageManager field
• CI uses Corepack to enable Yarn 4
• Updated documentation with setup instructions

CI/CD:

• New .github/workflows/ci.yml runs tests on both Node versions
• Updated deploy workflow to use Node 22
• All 230 tests passing