Windows CLI MCP Server

# Unit Test Task 12: Increase Coverage for Configuration and Path Validation ## Priority MEDIUM - Improve reliability without disrupting existing functionality. ## Description This task adds new unit tests to cover critical configuration and path validation code that currently has relatively low coverage. The goal is to bring overall statement coverage above **82%** and branch coverage above **75%** while ensuring the existing test suite remains stable. ## Scope - Test `validateConfig` helper in `src/utils/config.ts` for invalid values and error cases. - Test `createDefaultConfig` to ensure the file is written correctly without runtime validation functions. - Expand `toolDescription.details.test.ts` so each shell type is exercised and path format notes appear. - Add edge-case tests for `validateWorkingDirectory` in `src/utils/pathValidation.ts` including WSL and GitBash conversions and empty `allowedPaths` errors. - Add additional cases for `mergeConfigs` in `src/utils/config.ts` when user configs enable only subsets of shells or omit sections. ## Files to Modify/Create - `tests/configValidation.test.ts` (new) - `tests/defaultConfig.test.ts` (new) - `tests/toolDescription.details.test.ts` (update) - `tests/pathValidation.edge.test.ts` (new) - `tests/configMerge.test.ts` (new) ## Expected Coverage After Implementation - Statements: **≈82–84%** - Branches: **≈75–77%** - `src/utils/config.ts` line coverage above **80%** - `src/utils/pathValidation.ts` line coverage above **85%** ## Acceptance Criteria 1. All existing tests continue to pass (`npm test`). 2. New tests cover the scenarios listed in the Scope section. 3. Overall coverage meets the expected percentages when running `npm run test:coverage`. 4. Documentation for added tests is provided in `TEST_DESCRIPTIONS.md`. 5. No regressions or breaking changes in other unit tests. ## Implementation Notes - Use temporary directories via `fs.mkdtempSync` for file‑writing tests. - Mock shell configurations where necessary to isolate validation logic. - Follow existing test patterns for mocking and cleanup. - Document the added tests and update coverage numbers in `README` if necessary. ## Dependencies - None. ## Related Files - `src/utils/config.ts` - `src/utils/pathValidation.ts` - `src/toolDescription.ts` - `tests/toolDescription.details.test.ts`