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docs: update TODO.md with comprehensive coverage analysis and roadmap
- Complete rewrite based on actual coverage results (70.43% overall) - Document 4 files at 100% coverage: api-helper, api, inbox, proxy - Identify critical gaps: remote.ts (25.4%), commands.ts (56%), workspacesProvider.ts (65%) - Provide prioritized roadmap for achieving 90% overall coverage - Establish clear success metrics and next steps - 345 tests passing across 17 test files (complete test infrastructure) 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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‎TODO.md

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# VSCode Coder Extension - Testing Status & Roadmap
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# VSCode Coder Extension - Testing Status & Coverage Roadmap
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## Current Status ✅
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**Test Coverage Achieved:** 13/17 source files have comprehensive test coverage
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**Total Tests:** 257 tests passing across 13 test files
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**Test Framework:** Vitest with comprehensive mocking infrastructure
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### ✅ Completed Test Files (13 files)
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| File | Tests | Coverage | Status |
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|------|-------|----------|---------|
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| `src/api.test.ts` | 46 | 95%+ | ✅ Comprehensive |
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| `src/api-helper.test.ts` | 32 | 100% | ✅ Complete |
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| `src/commands.test.ts` | 12 | 85%+ | ✅ Core functionality |
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| `src/extension.test.ts` | 26 | 93%+ | ✅ Entry point & lifecycle |
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| `src/storage.test.ts` | 55 | 89%+ | ✅ Data persistence |
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| `src/workspacesProvider.test.ts` | 27 | 85%+ | ✅ Tree view provider |
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| `src/cliManager.test.ts` | 6 | 75%+ | ✅ CLI operations |
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| `src/error.test.ts` | 11 | 90%+ | ✅ Error handling |
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| `src/featureSet.test.ts` | 2 | 100% | ✅ Feature detection |
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| `src/headers.test.ts` | 9 | 85%+ | ✅ Header management |
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| `src/sshConfig.test.ts` | 14 | 90%+ | ✅ SSH configuration |
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| `src/sshSupport.test.ts` | 9 | 85%+ | ✅ SSH support utilities |
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| `src/util.test.ts` | 8 | 95%+ | ✅ Utility functions |
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### Key Achievements ✨
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1. **Core API Testing Complete**: All critical API functions (`makeCoderSdk`, `createStreamingFetchAdapter`, `waitForBuild`, etc.) have comprehensive test coverage
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2. **Extension Lifecycle**: Full testing of extension activation, command registration, and URI handling
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3. **Data Persistence**: Complete testing of storage operations, token management, and CLI configuration
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4. **Tree View Provider**: Comprehensive testing with proper mocking for complex VSCode tree interactions
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5. **Test Infrastructure**: Robust mocking system for VSCode APIs, file system, network, and child processes
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**Test Infrastructure Complete:** 17/17 source files have test files
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**Total Tests:** 345 tests passing across 17 test files
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**Test Framework:** Vitest with comprehensive mocking infrastructure
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**Overall Line Coverage:** 70.43% (significant gaps remain)
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## Remaining Work 🚧
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### 🔴 Missing Test Files (4 files remaining)
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#### High Priority
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- **`src/remote.ts`** - Remote connection handling
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- SSH connection setup and management
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- Workspace lifecycle (start/stop/monitor)
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- CLI integration and process management
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- **Complexity:** High (complex SSH logic, process management)
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#### Low Priority
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- **`src/proxy.ts`** - Proxy configuration
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- HTTP proxy URL resolution and NO_PROXY bypass logic
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- **Complexity:** Low (utility functions, minimal dependencies)
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- **`src/inbox.ts`** - Message handling
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- Message queuing and event-based processing
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- **Complexity:** Low (standalone utility)
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- **`src/workspaceMonitor.ts`** - Workspace monitoring
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- File watching and workspace state tracking
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- **Complexity:** Low (file system operations)
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### 📄 Non-Code Files
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- `src/typings/vscode.proposed.resolvers.d.ts` - TypeScript definitions (no tests needed)
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## Test Coverage Analysis 📊
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### 🎯 **100% Coverage Achieved (4 files)**
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| File | Lines | Status |
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|------|-------|---------|
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| `api-helper.ts` | 100% | ✅ Perfect coverage |
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| `api.ts` | 100% | ✅ Perfect coverage |
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| `inbox.ts` | 100% | ✅ Perfect coverage |
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| `proxy.ts` | 100% | ✅ Perfect coverage |
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### 🟢 **High Coverage (90%+ lines, 5 files)**
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| File | Lines | Tests | Priority |
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|------|-------|-------|----------|
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| `workspaceMonitor.ts` | 98.65% | 19 | ✅ Nearly complete |
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| `sshConfig.ts` | 96.21% | 14 | ✅ Nearly complete |
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| `extension.ts` | 93.44% | 26 | 🔸 Minor gaps |
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| `featureSet.ts` | 90.9% | 2 | 🔸 Minor gaps |
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| `cliManager.ts` | 90.05% | 6 | 🔸 Minor gaps |
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### 🟡 **Medium Coverage (70-90% lines, 4 files)**
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| File | Lines | Tests | Key Gaps |
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|------|-------|-------|----------|
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| `storage.ts` | 89.19% | 55 | Error scenarios, file operations |
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| `sshSupport.ts` | 88.78% | 9 | Edge cases, environment detection |
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| `headers.ts` | 85.08% | 9 | Complex header parsing scenarios |
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| `util.ts` | 79.19% | 8 | Helper functions, path operations |
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### 🔴 **Major Coverage Gaps (< 70% lines, 4 files)**
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| File | Lines | Tests | Status | Major Issues |
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|------|-------|-------|---------|--------------|
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| **`remote.ts`** | **25.4%** | 17 | 🚨 **Critical gap** | SSH setup, workspace lifecycle, error handling |
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| **`workspacesProvider.ts`** | **65.12%** | 27 | 🔸 Significant gaps | Tree operations, refresh logic, agent handling |
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| **`error.ts`** | **64.6%** | 11 | 🔸 Significant gaps | Error transformation, logging scenarios |
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| **`commands.ts`** | **56.01%** | 12 | 🔸 Significant gaps | Command implementations, user interactions |
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## Next Steps 🎯
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## Next Steps - Coverage Improvement 🎯
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### Phase 1: Complete Test Coverage (Priority)
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1. **`src/remote.ts`** - Implement comprehensive tests for remote connection handling
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- Focus on SSH connection setup, workspace lifecycle management
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- Mock child processes, file system operations, and CLI interactions
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- Test error scenarios and edge cases
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### **Phase 1: Critical Coverage Gaps (High Priority)**
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2. **Low-priority files** - Add basic test coverage for remaining utility files
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- `src/proxy.ts` - Test proxy URL resolution and bypass logic
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- `src/inbox.ts` - Test message queuing and processing
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- `src/workspaceMonitor.ts` - Test file watching and state tracking
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#### 1. **`remote.ts` - Critical Priority** 🚨
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- **Current:** 25.4% lines covered (Major problem!)
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- **Missing:** SSH connection setup, workspace lifecycle, process management
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- **Action:** Expand existing 17 tests to cover:
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- Complete `setup()` method flow
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- `maybeWaitForRunning()` scenarios
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- SSH config generation and validation
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- Process monitoring and error handling
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### Phase 2: Test Quality Improvements
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1. **Coverage Analysis** - Run coverage reports to identify gaps in existing tests
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2. **Integration Tests** - Add cross-module integration scenarios
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3. **Performance Tests** - Add timeout and concurrent operation testing
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4. **Flaky Test Prevention** - Ensure all tests are deterministic and reliable
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#### 2. **`commands.ts` - High Priority** 🔸
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- **Current:** 56.01% lines covered
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- **Missing:** Command implementations, user interaction flows
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- **Action:** Expand existing 12 tests to cover all command handlers
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### Phase 3: Test Infrastructure Enhancements
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1. **Test Helpers** - Create shared mock factories and test utilities
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2. **Custom Matchers** - Add VSCode-specific assertion helpers
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3. **CI/CD Integration** - Enhance automated testing and coverage reporting
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#### 3. **`workspacesProvider.ts` - High Priority** 🔸
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- **Current:** 65.12% lines covered
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- **Missing:** Tree refresh logic, agent selection, error scenarios
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- **Action:** Expand existing 27 tests for complete tree operations
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#### 4. **`error.ts` - Medium Priority** 🔸
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- **Current:** 64.6% lines covered
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- **Missing:** Error transformation scenarios, logging paths
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- **Action:** Expand existing 11 tests for all error types
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## Success Metrics 📊
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### **Phase 2: Polish Existing High Coverage Files**
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- **Target:** Get 90%+ files to 95%+ coverage
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- **Files:** `extension.ts`, `storage.ts`, `headers.ts`, `util.ts`, `sshSupport.ts`
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- **Effort:** Low (minor gap filling)
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- [x] **13/17** source files have test coverage (76% complete)
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- [x] **257** tests passing in CI mode
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- [x] **Zero** flaky tests (all tests deterministic)
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- [x] **< 1 second** average test execution time
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- [ ] **17/17** source files have test coverage (target: 100%)
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- [ ] **>90%** code coverage across all modules
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- [ ] **Integration test suite** for cross-module interactions
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### **Phase 3: Integration & Edge Case Testing**
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- **Cross-module integration scenarios**
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- **Complex error propagation testing**
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- **Performance and timeout scenarios**
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## Testing Standards 📋
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## Success Metrics 🎯
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### **Completed ✅**
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- [x] **17/17** source files have test files
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- [x] **345** tests passing (zero flaky tests)
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- [x] **4/17** files at 100% line coverage
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- [x] **9/17** files at 85%+ line coverage
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**Framework:** Vitest with TypeScript support
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**Mocking:** Comprehensive VSCode API, file system, network, and process mocking
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**Structure:** Descriptive test names with organized `describe()` blocks
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**Coverage:** Both success and failure scenarios, async/await error handling
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**Performance:** Fast execution with proper cleanup and resource management
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### **Target Goals 🎯**
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- [ ] **70% → 90%** overall line coverage (primary goal)
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- [ ] **`remote.ts`** from 25% → 80%+ coverage (critical)
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- [ ] **15/17** files at 85%+ line coverage
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- [ ] **8/17** files at 95%+ line coverage
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## Recent Achievements 🏆
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**Latest:** Fixed all workspacesProvider test failures through strategic refactoring
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- Resolved infinite recursion issues in test helper classes
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- Improved testability by extracting protected helper methods
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- Added proper test isolation and mocking strategies
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- **Result:** 27/27 tests passing (previously 21 failing)
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✅ **Test Infrastructure Complete** (Just completed)
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- Created test files for all 17 source files
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- Fixed workspacesProvider test failures through strategic refactoring
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- Added comprehensive tests for proxy, inbox, and workspaceMonitor
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- Established robust mocking patterns for VSCode APIs
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**Previous:** Completed comprehensive test coverage for 5 core modules:
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- `api.ts` - Full SDK and streaming functionality testing
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- `extension.ts` - Complete extension lifecycle testing
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- `storage.ts` - Comprehensive data persistence testing
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- `commands.ts` - VSCode command implementation testing
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- `api-helper.ts` - Complete utility function testing
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✅ **Perfect Coverage Achieved** (4 files)
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- `api-helper.ts`, `api.ts`, `inbox.ts`, `proxy.ts` at 100% coverage
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- Strong foundation with core API and utility functions fully tested
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**Priority:** Focus on `src/remote.ts` testing as the primary remaining complex module, then complete coverage for the remaining 3 low-complexity utility files.
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## Priority Action Items 📋
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**Immediate (Next Session):**
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1. 🚨 **Fix `remote.ts` coverage** - Expand from 25% to 80%+ (critical business logic)
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2. 🔸 **Improve `commands.ts`** - Expand from 56% to 80%+ (user-facing functionality)
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3. 🔸 **Polish `workspacesProvider.ts`** - Expand from 65% to 80%+ (UI component)
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**Secondary:**
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4. Fill remaining gaps in medium-coverage files
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5. Add integration test scenarios
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6. Performance and edge case testing
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**Target:** Achieve **90% overall line coverage** with robust, maintainable tests.

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