♻️ refactor(config.ts): Addition of UnitTest environment and unittest for commands/config.ts#getConfig (#330)

* feat(jest.config.ts): update jest preset for TS ESM support and ignore patterns
feat(package.json): add test:unit script with NODE_OPTIONS for ESM
refactor(src/commands/config.ts): improve dotenv usage with dynamic paths
feat(src/commands/config.ts): allow custom config and env paths in getConfig
refactor(src/commands/config.ts): streamline environment variable access

feat(test/unit): add unit tests for config handling and utility functions

- Implement unit tests for `getConfig` function to ensure correct behavior
  in various scenarios including default values, global config, and local
  env file precedence.
- Add utility function `prepareFile` for creating temporary files during
  tests, facilitating testing of file-based configurations.

* feat(e2e.yml): add unit-test job to GitHub Actions for running unit tests on pull requests

* ci(test.yml): add GitHub Actions workflow for unit and e2e tests on pull requests

* refactor(config.ts): streamline environment variable access using process.env directly
test(config.test.ts): add setup and teardown for environment variables in tests to ensure test isolation

* feat(package.json): add `test:all` script to run all tests in Docker
refactor(package.json): consolidate Docker build steps into `test:docker-build` script for DRY principle
fix(package.json): ensure `test:unit:docker` and `test:e2e:docker` scripts use the same Docker image and remove container after run
chore(test/Dockerfile): remove default CMD to allow dynamic test script execution in Docker

* refactor(config.test.ts): anonymize API keys in tests for better security practices

* feat(config.test.ts): add tests for OCO_ANTHROPIC_API_KEY configuration

* refactor(config.ts): streamline path imports and remove unused DotenvParseOutput

- Simplify path module imports by removing default import and using named imports for `pathJoin` and `pathResolve`.
- Remove unused `DotenvParseOutput` import to clean up the code.

* refactor(config.test.ts): simplify API key mock values for clarity in tests

* test(config.test.ts): remove tests for default config values and redundant cases

- Removed tests that checked for default config values when no config or env files are present, as these scenarios are now handled differently.
- Eliminated tests for empty global config and local env files to streamline testing focus on actual config loading logic.
- Removed test for prioritizing local env over global config due to changes in config loading strategy, simplifying the configuration management.

.github/workflows/test.yml

@@ -0,0 +1,46 @@
+name: Testing
+
+on: [pull_request]
+
+jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [20.x]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Install dependencies
+      run: npm install
+    - name: Run Unit Tests
+      run: npm run test:unit
+  e2e-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [20.x]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Install git
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y git
+        git --version
+    - name: Setup git
+      run: |
+        git config --global user.email "test@example.com"
+        git config --global user.name "Test User"
+    - name: Install dependencies
+      run: npm install
+    - name: Build
+      run: npm run build
+    - name: Run E2E Tests
+      run: npm run test:e2e