MCP Debugger

# packages/adapter-javascript/tests/unit/javascript-debug-adapter.lifecycle.edge.test.ts @source-hash: abc1a5259b664feb @generated: 2026-02-10T00:41:08Z **Test Suite: JavascriptDebugAdapter Edge Case Lifecycle Tests** This test file validates edge case behaviors in the JavascriptDebugAdapter lifecycle, specifically initialization warning handling and dispose cache clearing functionality. ## Dependencies & Setup - **Test Framework**: Vitest with mock capabilities (L1) - **Core Subject**: JavascriptDebugAdapter from adapter package (L3) - **Mock Dependencies**: Stubbed AdapterDependencies with logger (L8-15) - **External Mock**: executable-resolver.findNode function (L5) ## Test Structure **Mock Setup** (L18-21): Restores and clears all mocks before each test to ensure isolation. **Test Case 1: Warning Logging During Initialization** (L23-44) - Validates that initialization warnings are logged exactly once each - Mocks validateEnvironment to return specific warnings (L28-32) - Verifies state transition to READY and 'initialized' event emission - Asserts precise call counts and message ordering for logger.warn **Test Case 2: Cache Clearing on Dispose** (L46-71) - Tests that dispose() properly clears internal caches - Uses resolveExecutablePath() as cache validation mechanism - Mocks findNode to track call frequency vs caching behavior - Validates cache hit (no additional findNode call), dispose reset, and cache miss pattern - Cross-platform path handling for Windows vs Unix systems (L50) ## Key Behavioral Validations - **Initialization**: Warning deduplication and proper event/state handling - **Caching**: Per-instance cache lifecycle tied to dispose operations - **State Management**: Transitions between UNINITIALIZED and READY states - **Event Emission**: 'initialized' event fired exactly once per successful initialization ## Architecture Insights - Uses event-driven architecture with state management - Implements caching layer for executable resolution - Clear separation between validation warnings and errors - Mock-friendly design enabling precise behavioral testing