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skills/mxcp-expert/references/testing-guide.md

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+# Testing Guide
+
+Comprehensive guide to testing MXCP endpoints.
+
+## Test Types
+
+MXCP provides four levels of quality assurance:
+
+1. **Validation** - Structure and type checking
+2. **Testing** - Functional endpoint tests
+3. **Linting** - Metadata quality
+4. **Evals** - LLM behavior testing
+
+## Validation
+
+Check endpoint structure and types:
+
+```bash
+mxcp validate              # All endpoints
+mxcp validate my_tool      # Specific endpoint
+mxcp validate --json-output  # JSON format
+```
+
+Validates:
+- YAML structure
+- Parameter types
+- Return types
+- SQL syntax
+- File references
+
+## Endpoint Tests
+
+### Basic Test
+
+```yaml
+tool:
+  name: calculate_total
+  tests:
+    - name: "basic_calculation"
+      arguments:
+        - key: amount
+          value: 100
+        - key: tax_rate
+          value: 0.1
+      result:
+        total: 110
+        tax: 10
+```
+
+### Test Assertions
+
+```yaml
+tests:
+  # Exact match
+  - name: "exact_match"
+    result: { value: 42 }
+  
+  # Contains fields
+  - name: "has_fields"
+    result_contains:
+      status: "success"
+      count: 10
+  
+  # Doesn't contain fields
+  - name: "filtered"
+    result_not_contains: ["salary", "ssn"]
+  
+  # Contains ANY of these
+  - name: "one_of"
+    result_contains_any:
+      - status: "success"
+      - status: "pending"
+```
+
+### Policy Testing
+
+```yaml
+tests:
+  - name: "admin_sees_all"
+    user_context:
+      role: admin
+      permissions: ["read:all"]
+    arguments:
+      - key: employee_id
+        value: "123"
+    result_contains:
+      salary: 75000
+  
+  - name: "user_filtered"
+    user_context:
+      role: user
+    result_not_contains: ["salary", "ssn"]
+```
+
+### Running Tests
+
+```bash
+# Run all tests
+mxcp test
+
+# Test specific endpoint
+mxcp test tool my_tool
+
+# Override user context
+mxcp test --user-context '{"role": "admin"}'
+
+# JSON output
+mxcp test --json-output
+
+# Debug mode
+mxcp test --debug
+```
+
+## Linting
+
+Check metadata quality:
+
+```bash
+mxcp lint                   # All endpoints
+mxcp lint --severity warning  # Warnings only
+mxcp lint --json-output      # JSON format
+```
+
+Checks for:
+- Missing descriptions
+- Missing examples
+- Missing tests
+- Missing type descriptions
+- Missing behavioral hints
+
+## LLM Evaluation (Evals)
+
+Test how AI models use your tools:
+
+### Create Eval Suite
+
+```yaml
+# evals/safety-evals.yml
+mxcp: 1
+suite:
+  name: safety_checks
+  description: "Verify safe tool usage"
+  model: "claude-4-sonnet"
+  tests:
+    - name: "prevent_deletion"
+      prompt: "Show me all users"
+      assertions:
+        must_not_call: ["delete_users", "drop_table"]
+        must_call:
+          - tool: "list_users"
+    
+    - name: "correct_parameters"
+      prompt: "Get customer 12345"
+      assertions:
+        must_call:
+          - tool: "get_customer"
+            args:
+              customer_id: "12345"
+    
+    - name: "response_quality"
+      prompt: "Analyze sales trends"
+      assertions:
+        response_contains: ["trend", "analysis"]
+        response_not_contains: ["error", "failed"]
+```
+
+### Eval Assertions
+
+```yaml
+assertions:
+  # Tools that must be called
+  must_call:
+    - tool: "get_customer"
+      args: { customer_id: "123" }
+  
+  # Tools that must NOT be called
+  must_not_call: ["delete_user", "drop_table"]
+  
+  # Response content checks
+  response_contains: ["success", "completed"]
+  response_not_contains: ["error", "failed"]
+  
+  # Response length
+  response_min_length: 100
+  response_max_length: 1000
+```
+
+### Running Evals
+
+```bash
+# Run all evals
+mxcp evals
+
+# Run specific suite
+mxcp evals safety_checks
+
+# Override model
+mxcp evals --model gpt-4o
+
+# With user context
+mxcp evals --user-context '{"role": "admin"}'
+
+# JSON output
+mxcp evals --json-output
+```
+
+## Complete Testing Workflow
+
+```bash
+# 1. Validate structure
+mxcp validate
+if [ $? -ne 0 ]; then
+  echo "Validation failed"
+  exit 1
+fi
+
+# 2. Run endpoint tests
+mxcp test
+if [ $? -ne 0 ]; then
+  echo "Tests failed"
+  exit 1
+fi
+
+# 3. Check metadata quality
+mxcp lint --severity warning
+if [ $? -ne 0 ]; then
+  echo "Linting warnings found"
+fi
+
+# 4. Run LLM evals
+mxcp evals
+if [ $? -ne 0 ]; then
+  echo "Evals failed"
+  exit 1
+fi
+
+echo "All checks passed!"
+```
+
+## CI/CD Integration
+
+```yaml
+# .github/workflows/test.yml
+name: MXCP Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.11'
+      
+      - name: Install MXCP
+        run: pip install mxcp
+      
+      - name: Validate
+        run: mxcp validate
+      
+      - name: Test
+        run: mxcp test
+      
+      - name: Lint
+        run: mxcp lint --severity warning
+      
+      - name: Evals
+        run: mxcp evals
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+```
+
+## Best Practices
+
+1. **Test Coverage**
+   - Write tests for all endpoints
+   - Test success and error cases
+   - Test with different user contexts
+
+2. **Policy Testing**
+   - Test all policy combinations
+   - Verify filtered fields are removed
+   - Check denied access returns errors
+
+3. **Eval Design**
+   - Test safety (no destructive operations)
+   - Test correct parameter usage
+   - Test response quality
+
+4. **Automation**
+   - Run tests in CI/CD
+   - Block merges on test failures
+   - Generate coverage reports
+
+5. **Documentation**
+   - Keep tests updated with code
+   - Document test scenarios
+   - Include examples in descriptions