# Task ID: 36

**Title:** End-to-end integration testing

**Status:** done

**Dependencies:** 29 ✓, 33 ✓, 34 ✓, 35 ✓

**Priority:** high

**Description:** Create comprehensive integration tests that validate the full data flow from mcpctl through mcplocal to mcpd to MCP server containers and back.

**Details:**

1. Create test fixtures in `src/mcplocal/test/fixtures/`:
   - Mock MCP server that returns predictable responses
   - Test configuration files
   - Sample tool call payloads
2. Create integration test suite in `src/mcplocal/test/integration/`:
   ```typescript
   describe('End-to-end flow', () => {
     it('mcpctl -> mcplocal -> mcpd -> mcp_server', async () => {
       // Start mock MCP server
       // Start mcpd with test config
       // Start mcplocal pointing to mcpd
       // Execute mcpctl command
       // Verify response flows back correctly
     });
     
     it('LLM pre-processing reduces response size', async () => {
       // Send query that returns large dataset
       // Verify LLM filtering reduces token count
       // Verify relevant data is preserved
     });
     
     it('credentials never leave mcpd', async () => {
       // Monitor all traffic from mcplocal
       // Verify no credentials appear in requests/responses
     });
   });
   ```
3. Test scenarios:
   - Management commands (get servers, instances, etc.)
   - MCP tool calls with LLM preprocessing
   - MCP tool calls without preprocessing
   - Error handling (mcpd down, instance down, LLM failure)
   - Health monitoring accuracy
4. Add CI integration test workflow
5. Create docker-compose.test.yml for test environment

**Test Strategy:**

1. All integration tests pass in CI environment
2. Test coverage includes happy path and error scenarios
3. Performance benchmarks: measure latency at each tier
4. Security test: verify credential isolation
5. Load test: multiple concurrent requests
6. Chaos test: random component failures