langchain-ci-integration

# LangChain CI Integration ## Overview CI/CD pipeline for LangChain applications: mocked unit tests (free, fast), gated integration tests with real LLMs (costs money, slow), RAG pipeline validation, and LangSmith trace integration. ## GitHub Actions Workflow ```yaml # .github/workflows/langchain-tests.yml name: LangChain Tests on: pull_request: paths: ["src/**", "tests/**", "package.json"] jobs: unit-tests: runs-on: ubuntu-latest steps: - uses: actions/checkout@v4 - uses: actions/setup-node@v4 with: { node-version: "20" } - run: npm ci - name: Unit tests (no API calls) run: npx vitest run tests/unit/ --reporter=verbose integration-tests: runs-on: ubuntu-latest if: github.event.pull_request.draft == false needs: unit-tests steps: - uses: actions/checkout@v4 - uses: actions/setup-node@v4 with: { node-version: "20" } - run: npm ci - name: Integration tests (real LLM calls) env: OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }} LANGSMITH_TRACING: "true" LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }} LANGSMITH_PROJECT: "ci-${{ github.run_id }}" run: npx vitest run tests/integration/ --reporter=verbose typecheck: runs-on: ubuntu-latest steps: - uses: actions/checkout@v4 - uses: actions/setup-node@v4 with: { node-version: "20" } - run: npm ci - run: npx tsc --noEmit ``` ##...