[CHORE]: End-to-End MCP Gateway Stack Testing Harness (mcpgateway, translate, wrapper, mcp-servers)

## 🧭 **CHORE Summary — End-to-End MCP Gateway Stack Testing Harness**

Implement a **comprehensive end-to-end testing system** that validates the complete MCP Gateway stack with full component integration across all transport protocols and data stores:

1. **Multi-protocol fast-time-server** deployment (stdio, SSE, streamable HTTP)
2. **Protocol translation matrix** testing with mcpgateway.translate (any-to-any conversion)
3. **Wrapper authentication flow** validation (stdio → SSE with OAuth2 Bearer)
4. **Full gateway stack** with Redis cache and PostgreSQL persistence
5. **GitHub Actions integration** with matrix testing across all component combinations
6. **Comprehensive flow validation** from client request to data persistence and federation

---

## 🏗️ **Architecture Overview**

### **Complete Stack Architecture**
```mermaid
graph TB
 %% Client Layer
 subgraph "Client Applications"
 MCP_CLIENT[MCP Inspector/Claude Desktop JSON-RPC stdio]
 CURL_CLIENT[cURL/HTTP Client REST API]
 SSE_CLIENT[Browser/SSE Client EventSource]
 end

 %% Wrapper Layer
 subgraph "Protocol Wrapper Layer"
 WRAPPER[mcpgateway.wrapper stdio ↔ SSE Bridge OAuth2 Authentication]
 end

 %% Translation Layer
 subgraph "Protocol Translation Layer"
 TRANSLATE_STDIO[mcpgateway.translate stdio → SSE]
 TRANSLATE_SSE[mcpgateway.translate SSE → stdio]
 TRANSLATE_HTTP[mcpgateway.translate HTTP → SSE]
 end

 %% Gateway Core
 subgraph "MCP Gateway Core"
 GATEWAY[mcpgateway Main Gateway Instance FastAPI + L1 Cache]
 ADMIN_UI[Admin UI HTMX + Alpine.js]
 end

 %% Backend Services
 subgraph "Backend MCP Servers"
 FAST_TIME_STDIO[fast-time-server stdio mode]
 FAST_TIME_SSE[fast-time-server SSE mode :8001]
 FAST_TIME_HTTP[fast-time-server streamable HTTP :8002]
 EXTERNAL_MCP[External MCP Servers Various Protocols]
 end

 %% Data Layer
 subgraph "Data Persistence Layer"
 REDIS[(Redis Cluster L2 Cache + Sessions)]
 POSTGRES[(PostgreSQL Primary Storage)]
 end

 %% Federation Layer
 subgraph "Federation Layer"
 PEER_GATEWAY_1[Peer Gateway 1 Remote Instance]
 PEER_GATEWAY_2[Peer Gateway 2 Remote Instance]
 FEDERATION_REGISTRY[Federation Registry mDNS + Manual Config]
 end

 %% Connections - Client to Wrapper
 MCP_CLIENT -->|JSON-RPC stdio| WRAPPER
 CURL_CLIENT -->|HTTP/REST| GATEWAY
 SSE_CLIENT -->|EventSource| GATEWAY

 %% Wrapper to Gateway
 WRAPPER -->|Authenticated SSE| GATEWAY

 %% Translation flows
 TRANSLATE_STDIO -->|Expose stdio as SSE| GATEWAY
 TRANSLATE_SSE -->|Bridge SSE to stdio| FAST_TIME_STDIO
 TRANSLATE_HTTP -->|Convert HTTP to SSE| GATEWAY

 %% Gateway to backends
 GATEWAY -->|stdio subprocess| FAST_TIME_STDIO
 GATEWAY -->|HTTP SSE| FAST_TIME_SSE
 GATEWAY -->|HTTP REST| FAST_TIME_HTTP
 GATEWAY -->|Various protocols| EXTERNAL_MCP

 %% Gateway to data layer
 GATEWAY -->|Cache operations| REDIS
 GATEWAY -->|CRUD operations| POSTGRES

 %% Federation connections
 GATEWAY <-->|Federation protocol| PEER_GATEWAY_1
 GATEWAY <-->|Federation protocol| PEER_GATEWAY_2
 GATEWAY -->|Service discovery| FEDERATION_REGISTRY

 %% Admin UI
 ADMIN_UI -.->|Management| GATEWAY

 classDef client fill:#e3f2fd
 classDef wrapper fill:#f3e5f5
 classDef translate fill:#e8f5e8
 classDef gateway fill:#fff3e0
 classDef backend fill:#fce4ec
 classDef data fill:#f1f8e9
 classDef federation fill:#e0f2f1

 class MCP_CLIENT,CURL_CLIENT,SSE_CLIENT client
 class WRAPPER wrapper
 class TRANSLATE_STDIO,TRANSLATE_SSE,TRANSLATE_HTTP translate
 class GATEWAY,ADMIN_UI gateway
 class FAST_TIME_STDIO,FAST_TIME_SSE,FAST_TIME_HTTP,EXTERNAL_MCP backend
 class REDIS,POSTGRES data
 class PEER_GATEWAY_1,PEER_GATEWAY_2,FEDERATION_REGISTRY federation
```

### **End-to-End Test Flow**
```mermaid
sequenceDiagram
 participant Client as MCP Client
 participant Wrapper as mcpgateway.wrapper
 participant Gateway as MCP Gateway
 participant Translate as mcpgateway.translate
 participant TimeServer as fast-time-server
 participant Redis as Redis Cache
 participant Postgres as PostgreSQL

 Note over Client,Postgres: E2E Test Flow: Get Current Time

 %% 1. Client initialization
 Client->>Wrapper: JSON-RPC initialize
 Wrapper->>Gateway: SSE connect (OAuth2 Bearer)
 Gateway->>Redis: Check session cache
 Redis-->>Gateway: Session state
 Gateway-->>Wrapper: SSE connection established
 Wrapper-->>Client: Initialize response

 %% 2. Tool discovery
 Client->>Wrapper: tools/list request
 Wrapper->>Gateway: Forward via SSE
 Gateway->>Postgres: Query registered tools
 Postgres-->>Gateway: Tool definitions
 Gateway->>Redis: Cache tool list
 Gateway-->>Wrapper: Tools response via SSE
 Wrapper-->>Client: Tools list

 %% 3. Tool execution - stdio path
 Client->>Wrapper: tools/call get_current_time
 Wrapper->>Gateway: Forward via SSE
 Gateway->>Translate: Route to stdio server
 Translate->>TimeServer: JSON-RPC stdio
 TimeServer-->>Translate: Time response
 Translate-->>Gateway: SSE response
 Gateway->>Postgres: Log tool call
 Gateway->>Redis: Cache result
 Gateway-->>Wrapper: Tool result via SSE
 Wrapper-->>Client: Time result

 %% 4. Tool execution - HTTP path (parallel test)
 Client->>Gateway: Direct HTTP call
 Gateway->>TimeServer: HTTP streamable request
 TimeServer-->>Gateway: HTTP time response
 Gateway->>Postgres: Log tool call
 Gateway->>Redis: Cache result
 Gateway-->>Client: JSON response

 %% 5. Federation test
 Gateway->>Gateway: Discover federated tools
 Gateway->>Redis: Check federation cache
 Gateway->>Postgres: Store federation state
```

---

## 🌊 **Test Matrix & Component Combinations**

| Test Suite | fast-time-server | Translation | Gateway | Wrapper | Data Stores | Duration |
|------------|------------------|-------------|---------|---------|-------------|----------|
| **Minimal** | stdio only | None | Memory only | Basic | SQLite | 5 min |
| **Basic** | stdio + SSE | stdio→SSE | Redis L2 | OAuth2 | Redis + SQLite | 10 min |
| **Standard** | All 3 protocols | Full matrix | Redis + L1 | Full auth | Redis + PostgreSQL | 20 min |
| **Enterprise** | All + federation | All + mocks | Cluster mode | Multi-tenant | Redis cluster + PostgreSQL HA | 45 min |

> **Protocol Combinations Tested**: 9 combinations (3 time-server modes × 3 client access patterns)

---

### 🧱 Areas Affected

* [x] **Make targets** — `make e2e-test-{suite}`, `make test-protocol-matrix`, `make test-full-stack`
* [x] **CI / GitHub Actions** — Matrix testing across all component combinations
* [x] **Docker Compose** — Multi-service stack with all components
* [x] **Test infrastructure** — Protocol-specific test clients, component health checks
* [x] **Integration tests** — Complete flow validation from client to persistence
* [x] **Documentation** — Comprehensive E2E testing guide with troubleshooting

---

### ⚙️ Context / Rationale

Current testing gaps that prevent confident production deployment:

| Critical Question | Today | After This Epic |
|-------------------|-------|-----------------|
| **Full stack integration** works end-to-end? | ❓ Unknown | ✅ All component combinations tested |
| **Protocol translation** handles edge cases? | ❓ Unknown | 📊 Matrix testing across all protocol pairs |
| **Authentication flow** secure in wrapper chain? | ❓ Unknown | 🔐 OAuth2 Bearer token validation |
| **Data persistence** consistent across flows? | ❓ Unknown | 📋 Database state validation |
| **Federation** works with real deployments? | ❓ Unknown | 🌐 Multi-gateway federation testing |

**Real-world scenarios validated:**
- Complete MCP client workflow through wrapper with authentication
- Protocol translation across stdio ↔ SSE ↔ HTTP patterns
- Cache consistency between L1 (in-memory) and L2 (Redis)
- Database persistence of tools, sessions, and federation state
- Error handling and graceful degradation across component failures

---

### 📐 Enhanced Test Environment Architecture

**Complete E2E Test Stack:**
```mermaid
flowchart TD
 %% Test Orchestration
 subgraph "Test Orchestration Layer"
 PYTEST[pytest E2E Suite Test Discovery & Execution]
 DOCKER_COMPOSE[Docker Compose Stack Orchestration]
 HEALTH_CHECK[Health Check Service Component Readiness]
 end

 %% Test Clients
 subgraph "Test Client Layer"
 MCP_TEST_CLIENT[MCP Test Client JSON-RPC stdio]
 HTTP_TEST_CLIENT[HTTP Test Client REST + SSE]
 FEDERATION_CLIENT[Federation Test Client Multi-gateway]
 end

 %% Component Under Test
 subgraph "Components Under Test"
 WRAPPER_CUT[mcpgateway.wrapper stdio ↔ SSE Bridge]
 TRANSLATE_CUT[mcpgateway.translate Protocol Matrix]
 GATEWAY_CUT[mcpgateway Main Gateway]
 TIME_SERVER_CUT[fast-time-server All 3 Modes]
 end

 %% Data Layer
 subgraph "Data Services"
 REDIS_TEST[Redis Cache + Sessions]
 POSTGRES_TEST[PostgreSQL Persistence]
 SQLITE_TEST[SQLite Lightweight option]
 end

 %% Mock Services
 subgraph "Mock & Federation Services"
 MOCK_MCP[Mock MCP Servers Protocol testing]
 PEER_GATEWAY_MOCK[Mock Peer Gateways Federation testing]
 AUTH_MOCK[Mock Auth Service OAuth2 testing]
 end

 %% Test Flow Connections
 PYTEST --> DOCKER_COMPOSE
 DOCKER_COMPOSE --> HEALTH_CHECK
 
 MCP_TEST_CLIENT --> WRAPPER_CUT
 HTTP_TEST_CLIENT --> GATEWAY_CUT
 FEDERATION_CLIENT --> GATEWAY_CUT
 
 WRAPPER_CUT --> GATEWAY_CUT
 TRANSLATE_CUT --> GATEWAY_CUT
 GATEWAY_CUT --> TIME_SERVER_CUT
 
 GATEWAY_CUT --> REDIS_TEST
 GATEWAY_CUT --> POSTGRES_TEST
 GATEWAY_CUT --> SQLITE_TEST
 
 GATEWAY_CUT --> MOCK_MCP
 GATEWAY_CUT --> PEER_GATEWAY_MOCK
 WRAPPER_CUT --> AUTH_MOCK

 classDef orchestration fill:#ffeb3b
 classDef client fill:#4caf50
 classDef component fill:#2196f3
 classDef data fill:#ff9800
 classDef mock fill:#9c27b0

 class PYTEST,DOCKER_COMPOSE,HEALTH_CHECK orchestration
 class MCP_TEST_CLIENT,HTTP_TEST_CLIENT,FEDERATION_CLIENT client
 class WRAPPER_CUT,TRANSLATE_CUT,GATEWAY_CUT,TIME_SERVER_CUT component
 class REDIS_TEST,POSTGRES_TEST,SQLITE_TEST data
 class MOCK_MCP,PEER_GATEWAY_MOCK,AUTH_MOCK mock
```

---

### 📋 Enhanced Acceptance Criteria

| # | Criteria | Validation Method |
|---|----------|-------------------|
| 1 | **Complete stack integration**: All components work together end-to-end | E2E test suite passes with 100% component coverage |
| 2 | **Protocol matrix testing**: All 9 protocol combinations validated | Matrix test reports show successful translation paths |
| 3 | **Authentication security**: OAuth2 Bearer flow secure in production | Security test suite validates token handling |
| 4 | **Data consistency**: All persistence layers maintain state correctly | Database validation tests pass |
| 5 | **Federation functionality**: Multi-gateway federation works reliably | Federation test suite with mock gateways |
| 6 | **CI integration**: All tests run automatically in GitHub Actions | CI pipeline completes successfully |

---

### 🛠️ Comprehensive Task List

#### **Phase 1: Fast-Time-Server Multi-Protocol Deployment**

* **1.1** **Multi-protocol time server configuration** `docker-compose.e2e.yml`
 ```yaml
 # Fast-time-server in all three modes
 fast-time-stdio:
 build:
 context: ./tests/fixtures/fast-time-server
 dockerfile: Dockerfile
 command: ["python", "-m", "fast_time_server", "--mode", "stdio"]
 stdin_open: true
 tty: true
 networks:
 - e2e-test-network

 fast-time-sse:
 build:
 context: ./tests/fixtures/fast-time-server
 dockerfile: Dockerfile
 command: ["python", "-m", "fast_time_server", "--mode", "sse", "--port", "8001"]
 ports:
 - "8001:8001"
 networks:
 - e2e-test-network
 healthcheck:
 test: ["CMD", "curl", "-f", "http://localhost:8001/health"]
 interval: 5s
 timeout: 3s
 retries: 5

 fast-time-http:
 build:
 context: ./tests/fixtures/fast-time-server
 dockerfile: Dockerfile
 command: ["python", "-m", "fast_time_server", "--mode", "streamable-http", "--port", "8002"]
 ports:
 - "8002:8002"
 networks:
 - e2e-test-network
 healthcheck:
 test: ["CMD", "curl", "-f", "http://localhost:8002/health"]
 interval: 5s
 timeout: 3s
 retries: 5
 ```

* **1.2** **Enhanced fast-time-server implementation** `tests/fixtures/fast-time-server/fast_time_server.py`
 ```python
 # Enhanced fast-time-server supporting all 3 protocols
 import asyncio
 import json
 import sys
 from datetime import datetime
 from typing import Any, Dict, Optional
 import argparse
 from fastapi import FastAPI, Request
 from fastapi.responses import StreamingResponse
 from sse_starlette.sse import EventSourceResponse
 import uvicorn

 class FastTimeServer:
 def __init__(self, mode: str = "stdio"):
 self.mode = mode
 self.app = FastAPI() if mode in ["sse", "streamable-http"] else None
 self._setup_handlers()

 def _setup_handlers(self):
 """Setup protocol-specific handlers"""
 if self.mode == "stdio":
 self._setup_stdio_handlers()
 elif self.mode == "sse":
 self._setup_sse_handlers()
 elif self.mode == "streamable-http":
 self._setup_http_handlers()

 def _setup_stdio_handlers(self):
 """Setup stdio JSON-RPC handlers"""
 # Standard MCP stdio implementation
 pass

 def _setup_sse_handlers(self):
 """Setup SSE endpoint handlers"""
 @self.app.get("/sse")
 async def sse_endpoint():
 async def event_generator():
 while True:
 yield {
 "event": "keepalive",
 "data": json.dumps({"timestamp": datetime.utcnow().isoformat()})
 }
 await asyncio.sleep(30)
 return EventSourceResponse(event_generator())

 @self.app.post("/message")
 async def message_handler(request: Request):
 data = await request.json()
 if data.get("method") == "tools/call" and data.get("params", {}).get("name") == "get_current_time":
 return self._get_time_response(data.get("id"))
 return {"jsonrpc": "2.0", "id": data.get("id"), "error": {"code": -32601, "message": "Method not found"}}

 def _setup_http_handlers(self):
 """Setup streamable HTTP handlers"""
 @self.app.get("/health")
 async def health_check():
 return {"status": "healthy", "mode": self.mode}

 @self.app.post("/tools/call")
 async def call_tool(request: Request):
 data = await request.json()
 if data.get("name") == "get_current_time":
 return self._get_time_response()
 return {"error": "Tool not found"}

 def _get_time_response(self, request_id: Optional[str] = None) -> Dict[str, Any]:
 """Generate time response in MCP format"""
 current_time = datetime.utcnow().isoformat() + "Z"
 
 response = {
 "content": [{
 "type": "text",
 "text": json.dumps({
 "current_time": current_time,
 "timezone": "UTC",
 "mode": self.mode
 })
 }],
 "isError": False
 }
 
 if request_id:
 return {"jsonrpc": "2.0", "id": request_id, "result": response}
 return response

 async def run_stdio(self):
 """Run in stdio mode"""
 while True:
 try:
 line = await asyncio.get_event_loop().run_in_executor(None, sys.stdin.readline)
 if not line:
 break
 
 data = json.loads(line.strip())
 response = await self._handle_stdio_request(data)
 print(json.dumps(response), flush=True)
 except Exception as e:
 error_response = {
 "jsonrpc": "2.0",
 "id": data.get("id") if 'data' in locals() else None,
 "error": {"code": -32603, "message": f"Internal error: {str(e)}"}
 }
 print(json.dumps(error_response), flush=True)

 async def _handle_stdio_request(self, data: Dict[str, Any]) -> Dict[str, Any]:
 """Handle stdio JSON-RPC request"""
 method = data.get("method")
 
 if method == "initialize":
 return {
 "jsonrpc": "2.0",
 "id": data.get("id"),
 "result": {
 "protocolVersion": "2025-03-26",
 "capabilities": {"tools": {"listChanged": False}},
 "serverInfo": {"name": "fast-time-server", "version": "1.0.0"}
 }
 }
 elif method == "tools/list":
 return {
 "jsonrpc": "2.0",
 "id": data.get("id"),
 "result": {
 "tools": [{
 "name": "get_current_time",
 "description": "Get the current time",
 "inputSchema": {
 "type": "object",
 "properties": {
 "timezone": {"type": "string", "default": "UTC"}
 }
 }
 }]
 }
 }
 elif method == "tools/call":
 return {
 "jsonrpc": "2.0",
 "id": data.get("id"),
 "result": self._get_time_response()
 }
 else:
 return {
 "jsonrpc": "2.0",
 "id": data.get("id"),
 "error": {"code": -32601, "message": "Method not found"}
 }

 def run(self, host: str = "0.0.0.0", port: int = 8000):
 """Run the server"""
 if self.mode == "stdio":
 asyncio.run(self.run_stdio())
 else:
 uvicorn.run(self.app, host=host, port=port)

 if __name__ == "__main__":
 parser = argparse.ArgumentParser()
 parser.add_argument("--mode", choices=["stdio", "sse", "streamable-http"], default="stdio")
 parser.add_argument("--port", type=int, default=8000)
 args = parser.parse_args()
 
 server = FastTimeServer(args.mode)
 server.run(port=args.port)
 ```

#### **Phase 2: Protocol Translation Matrix Testing**

* **2.1** **Translation service configuration** `docker-compose.e2e.yml` (addition)
 ```yaml
 # Protocol translation services
 translate-stdio-to-sse:
 build:
 context: .
 dockerfile: Dockerfile
 command: ["python", "-m", "mcpgateway.translate", "--stdio", "python /app/tests/fixtures/fast-time-server/fast_time_server.py --mode stdio", "--port", "9001"]
 ports:
 - "9001:9001"
 depends_on:
 - fast-time-stdio
 networks:
 - e2e-test-network

 translate-sse-to-stdio:
 build:
 context: .
 dockerfile: Dockerfile
 command: ["python", "-m", "mcpgateway.translate", "--sse", "http://fast-time-sse:8001/sse"]
 stdin_open: true
 tty: true
 depends_on:
 - fast-time-sse
 networks:
 - e2e-test-network
 ```

* **2.2** **Protocol matrix test suite** `tests/e2e/test_protocol_matrix.py`
 ```python
 # Comprehensive protocol translation testing
 import pytest
 import asyncio
 import json
 import httpx
 from typing import Dict, Any
 from tests.e2e.fixtures import E2ETestHarness

 class TestProtocolMatrix:
 """Test all protocol translation combinations"""

 @pytest.fixture
 def test_harness(self):
 return E2ETestHarness()

 @pytest.mark.asyncio
 async def test_stdio_to_sse_translation(self, test_harness):
 """Test stdio server exposed via SSE"""
 # Connect to translated SSE endpoint
 async with httpx.AsyncClient() as client:
 # Test SSE connection
 response = await client.get("http://localhost:9001/sse")
 assert response.status_code == 200
 
 # Test message sending
 message = {
 "jsonrpc": "2.0",
 "id": 1,
 "method": "tools/call",
 "params": {"name": "get_current_time"}
 }
 
 response = await client.post("http://localhost:9001/message", json=message)
 assert response.status_code == 200
 
 result = response.json()
 assert result["jsonrpc"] == "2.0"
 assert "result" in result

 @pytest.mark.asyncio 
 async def test_sse_to_stdio_translation(self, test_harness):
 """Test SSE server accessed via stdio"""
 # This would test the reverse translation
 # Implementation would use subprocess to communicate with translate service
 pass

 @pytest.mark.asyncio
 async def test_full_translation_chain(self, test_harness):
 """Test complete chain: stdio → SSE → HTTP → gateway"""
 # Test complex translation chains
 pass

 @pytest.mark.parametrize("source_protocol,target_protocol", [
 ("stdio", "sse"),
 ("sse", "stdio"),
 ("http", "sse"),
 ("sse", "http")
 ])
 async def test_protocol_translation_matrix(self, source_protocol, target_protocol, test_harness):
 """Test all protocol translation combinations"""
 result = await test_harness.test_protocol_translation(source_protocol, target_protocol)
 assert result.success
 assert result.response_time < 1.0 # Max 1 second
 assert result.data_integrity_check_passed
 ```

#### **Phase 3: Wrapper Authentication Flow Testing**

* **3.1** **Wrapper service with authentication** `docker-compose.e2e.yml` (addition)
 ```yaml
 # MCP Gateway Wrapper with OAuth2
 mcpgateway-wrapper:
 build:
 context: .
 dockerfile: Dockerfile
 command: ["python", "-m", "mcpgateway.wrapper"]
 environment:
 - MCP_AUTH_TOKEN=${E2E_TEST_TOKEN}
 - MCP_SERVER_CATALOG_URLS=http://mcpgateway:4444/servers/1
 - LOG_LEVEL=debug
 stdin_open: true
 tty: true
 depends_on:
 - mcpgateway
 networks:
 - e2e-test-network
 ```

* **3.2** **Authentication flow tests** `tests/e2e/test_auth_flow.py`
 ```python
 # Authentication and security testing
 import pytest
 import asyncio
 import json
 import subprocess
 from tests.e2e.fixtures import E2ETestHarness

 class TestAuthenticationFlow:
 """Test complete authentication flow through wrapper"""

 @pytest.fixture
 def test_harness(self):
 return E2ETestHarness()

 @pytest.mark.asyncio
 async def test_wrapper_oauth2_flow(self, test_harness):
 """Test OAuth2 Bearer token authentication through wrapper"""
 # Generate test token
 token = await test_harness.generate_test_token(username="e2e-test", exp=3600)
 
 # Configure wrapper with token
 wrapper_process = await test_harness.start_wrapper_with_token(token)
 
 try:
 # Test initialization through wrapper
 init_request = {
 "jsonrpc": "2.0",
 "id": 1,
 "method": "initialize",
 "params": {
 "protocolVersion": "2025-03-26",
 "capabilities": {},
 "clientInfo": {"name": "e2e-test", "version": "1.0.0"}
 }
 }
 
 response = await test_harness.send_stdio_message(wrapper_process, init_request)
 assert response["jsonrpc"] == "2.0"
 assert "result" in response
 assert response["result"]["serverInfo"]["name"] == "mcpgateway-wrapper"
 
 # Test tools listing
 tools_request = {"jsonrpc": "2.0", "id": 2, "method": "tools/list"}
 response = await test_harness.send_stdio_message(wrapper_process, tools_request)
 assert "result" in response
 assert "tools" in response["result"]
 
 finally:
 await test_harness.stop_wrapper(wrapper_process)

 @pytest.mark.asyncio
 async def test_wrapper_auth_failure(self, test_harness):
 """Test authentication failure handling"""
 # Test with invalid token
 invalid_token = "invalid.token.here"
 
 wrapper_process = await test_harness.start_wrapper_with_token(invalid_token)
 
 try:
 init_request = {
 "jsonrpc": "2.0",
 "id": 1,
 "method": "initialize",
 "params": {"protocolVersion": "2025-03-26", "capabilities": {}}
 }
 
 response = await test_harness.send_stdio_message(wrapper_process, init_request)
 assert "error" in response
 assert response["error"]["code"] == -32603 # Internal error
 
 finally:
 await test_harness.stop_wrapper(wrapper_process)
 ```

#### **Phase 4: Full Gateway Stack Integration**

* **4.1** **Complete stack configuration** `docker-compose.e2e.yml` (addition)
 ```yaml
 # Complete MCP Gateway stack
 redis:
 image: redis:7-alpine
 ports:
 - "6379:6379"
 command: redis-server --appendonly yes
 volumes:
 - redis-data:/data
 networks:
 - e2e-test-network

 postgres:
 image: postgres:15-alpine
 ports:
 - "5432:5432"
 environment:
 - POSTGRES_DB=mcpgateway_e2e
 - POSTGRES_USER=test
 - POSTGRES_PASSWORD=test
 volumes:
 - postgres-data:/var/lib/postgresql/data
 networks:
 - e2e-test-network
 healthcheck:
 test: ["CMD-SHELL", "pg_isready -U test -d mcpgateway_e2e"]
 interval: 5s
 timeout: 3s
 retries: 5

 mcpgateway:
 build:
 context: .
 dockerfile: Dockerfile
 ports:
 - "4444:4444"
 environment:
 - DATABASE_URL=postgresql://test:test@postgres:5432/mcpgateway_e2e
 - REDIS_URL=redis://redis:6379
 - JWT_SECRET_KEY=e2e-test-secret-key
 - BASIC_AUTH_PASSWORD=e2e-test
 - LOG_LEVEL=debug
 - CACHE_ENABLED=true
 depends_on:
 postgres:
 condition: service_healthy
 redis:
 condition: service_started
 networks:
 - e2e-test-network
 healthcheck:
 test: ["CMD", "curl", "-f", "http://localhost:4444/health"]
 interval: 10s
 timeout: 5s
 retries: 5

 volumes:
 redis-data:
 postgres-data:

 networks:
 e2e-test-network:
 driver: bridge
 ```

* **4.2** **Full stack integration tests** `tests/e2e/test_full_stack.py`
 ```python
 # Complete end-to-end stack testing
 import pytest
 import asyncio
 import json
 import httpx
 import psycopg2
 import redis
 from tests.e2e.fixtures import E2ETestHarness

 class TestFullStackIntegration:
 """Test complete stack integration"""

 @pytest.fixture
 def test_harness(self):
 return E2ETestHarness()

 @pytest.mark.asyncio
 async def test_complete_e2e_flow(self, test_harness):
 """Test complete end-to-end flow with all components"""
 # 1. Setup - register time server with gateway
 token = await test_harness.generate_test_token()
 
 # Register fast-time-server (SSE mode) with gateway
 async with httpx.AsyncClient() as client:
 gateway_response = await client.post(
 "http://localhost:4444/gateways",
 headers={"Authorization": f"Bearer {token}"},
 json={
 "name": "fast-time-sse",
 "url": "http://fast-time-sse:8001/sse"
 }
 )
 assert gateway_response.status_code == 201
 gateway_id = gateway_response.json()["id"]

 # Create virtual server
 server_response = await client.post(
 "http://localhost:4444/servers",
 headers={"Authorization": f"Bearer {token}"},
 json={
 "name": "e2e-test-server",
 "description": "E2E test server",
 "associatedTools": ["1"] # Assuming tool ID 1
 }
 )
 assert server_response.status_code == 201
 server_id = server_response.json()["id"]

 # 2. Test via wrapper
 wrapper_process = await test_harness.start_wrapper_with_token(token)
 
 try:
 # Initialize
 init_response = await test_harness.send_stdio_message(wrapper_process, {
 "jsonrpc": "2.0", "id": 1, "method": "initialize",
 "params": {"protocolVersion": "2025-03-26", "capabilities": {}}
 })
 assert "result" in init_response

 # List tools
 tools_response = await test_harness.send_stdio_message(wrapper_process, {
 "jsonrpc": "2.0", "id": 2, "method": "tools/list"
 })
 assert "result" in tools_response
 tools = tools_response["result"]["tools"]
 assert len(tools) > 0
 assert any(tool["name"] == "get_current_time" for tool in tools)

 # Call tool
 call_response = await test_harness.send_stdio_message(wrapper_process, {
 "jsonrpc": "2.0", "id": 3, "method": "tools/call",
 "params": {"name": "get_current_time", "arguments": {"timezone": "UTC"}}
 })
 assert "result" in call_response
 assert "content" in call_response["result"]

 finally:
 await test_harness.stop_wrapper(wrapper_process)

 # 3. Verify data persistence
 await test_harness.verify_postgres_state(server_id, gateway_id)
 await test_harness.verify_redis_cache()

 @pytest.mark.asyncio
 async def test_cache_consistency(self, test_harness):
 """Test L1/L2 cache consistency"""
 # Test cache behavior across multiple requests
 pass

 @pytest.mark.asyncio
 async def test_federation_integration(self, test_harness):
 """Test federation with multiple gateway instances"""
 # Test federation discovery and tool aggregation
 pass
 ```

#### **Phase 5: GitHub Actions CI Integration**

* **5.1** **E2E testing workflow** `.github/workflows/e2e-tests.yml`
 ```yaml
 name: End-to-End Stack Testing

 on:
 push:
 branches: [main, develop]
 pull_request:
 branches: [main]
 schedule:
 - cron: '0 6 * * *' # Daily at 6 AM UTC

 jobs:
 e2e-matrix:
 runs-on: ubuntu-latest
 strategy:
 matrix:
 test-suite: [minimal, basic, standard, enterprise]
 include:
 - test-suite: minimal
 time-server-modes: "stdio"
 data-stores: "sqlite"
 duration: "5m"
 - test-suite: basic
 time-server-modes: "stdio,sse"
 data-stores: "redis,sqlite"
 duration: "10m"
 - test-suite: standard
 time-server-modes: "stdio,sse,http"
 data-stores: "redis,postgresql"
 duration: "20m"
 - test-suite: enterprise
 time-server-modes: "stdio,sse,http"
 data-stores: "redis,postgresql"
 duration: "45m"
 federation: true
 fail-fast: false

 steps:
 - uses: actions/checkout@v4

 - name: Set up Docker Buildx
 uses: docker/setup-buildx-action@v3

 - name: Generate test JWT token
 run: |
 export E2E_TEST_TOKEN=$(python3 -c "
 import jwt
 import time
 token = jwt.encode({
 'username': 'e2e-test',
 'exp': int(time.time()) + 3600
 }, 'e2e-test-secret-key', algorithm='HS256')
 print(token)
 ")
 echo "E2E_TEST_TOKEN=$E2E_TEST_TOKEN" >> $GITHUB_ENV

 - name: Start E2E test stack
 run: |
 # Configure stack based on test suite
 export TEST_SUITE=${{ matrix.test-suite }}
 export TIME_SERVER_MODES="${{ matrix.time-server-modes }}"
 export DATA_STORES="${{ matrix.data-stores }}"
 
 # Start stack
 docker-compose -f docker-compose.e2e.yml up -d
 
 # Wait for health checks
 timeout 300s bash -c 'until docker-compose -f docker-compose.e2e.yml ps | grep -q "healthy"; do sleep 10; done'

 - name: Run E2E test suite
 timeout-minutes: ${{ fromJSON('{"minimal": 10, "basic": 15, "standard": 30, "enterprise": 60}')[matrix.test-suite] }}
 run: |
 # Run tests based on suite
 case "${{ matrix.test-suite }}" in
 minimal)
 pytest tests/e2e/test_basic_integration.py -v --tb=short
 ;;
 basic)
 pytest tests/e2e/test_protocol_matrix.py tests/e2e/test_auth_flow.py -v --tb=short
 ;;
 standard)
 pytest tests/e2e/ -v --tb=short -k "not enterprise"
 ;;
 enterprise)
 pytest tests/e2e/ -v --tb=short
 ;;
 esac

 - name: Validate data persistence
 run: |
 # Check database state
 docker exec postgres psql -U test -d mcpgateway_e2e -c "SELECT COUNT(*) FROM servers;"
 docker exec postgres psql -U test -d mcpgateway_e2e -c "SELECT COUNT(*) FROM tools;"
 
 # Check Redis cache
 docker exec redis redis-cli DBSIZE

 - name: Collect logs and artifacts
 if: always()
 run: |
 mkdir -p artifacts/${{ matrix.test-suite }}
 
 # Collect container logs
 docker-compose -f docker-compose.e2e.yml logs > artifacts/${{ matrix.test-suite }}/docker-logs.txt
 
 # Collect test reports
 cp -r test-reports/ artifacts/${{ matrix.test-suite }}/ || true
 
 # Export database state
 docker exec postgres pg_dump -U test mcpgateway_e2e > artifacts/${{ matrix.test-suite }}/database-dump.sql || true

 - name: Upload artifacts
 uses: actions/upload-artifact@v4
 if: always()
 with:
 name: e2e-test-${{ matrix.test-suite }}-${{ github.sha }}
 retention-days: 14
 path: artifacts/

 - name: Cleanup
 if: always()
 run: |
 docker-compose -f docker-compose.e2e.yml down -v
 docker system prune -f
 ```

#### **Phase 6: Test Utilities and Fixtures**

* **6.1** **E2E test harness** `tests/e2e/fixtures.py`
 ```python
 # E2E test utilities and fixtures
 import asyncio
 import json
 import subprocess
 import time
 from typing import Any, Dict, Optional
 import httpx
 import jwt
 import psycopg2
 import redis

 class E2ETestHarness:
 """Comprehensive E2E testing utilities"""

 def __init__(self):
 self.jwt_secret = "e2e-test-secret-key"
 self.gateway_url = "http://localhost:4444"
 self.redis_client = redis.Redis(host='localhost', port=6379, decode_responses=True)
 self.postgres_conn = None

 async def generate_test_token(self, username: str = "e2e-test", exp: int = 3600) -> str:
 """Generate JWT token for testing"""
 payload = {
 "username": username,
 "exp": int(time.time()) + exp
 }
 return jwt.encode(payload, self.jwt_secret, algorithm="HS256")

 async def start_wrapper_with_token(self, token: str) -> subprocess.Popen:
 """Start wrapper process with authentication token"""
 env = {
 "MCP_AUTH_TOKEN": token,
 "MCP_SERVER_CATALOG_URLS": f"{self.gateway_url}/servers/1",
 "LOG_LEVEL": "debug"
 }
 
 process = subprocess.Popen(
 ["python", "-m", "mcpgateway.wrapper"],
 stdin=subprocess.PIPE,
 stdout=subprocess.PIPE,
 stderr=subprocess.PIPE,
 text=True,
 env=env
 )
 
 # Wait for wrapper to initialize
 await asyncio.sleep(2)
 return process

 async def send_stdio_message(self, process: subprocess.Popen, message: Dict[str, Any]) -> Dict[str, Any]:
 """Send JSON-RPC message via stdio and get response"""
 message_str = json.dumps(message) + "\n"
 process.stdin.write(message_str)
 process.stdin.flush()
 
 # Read response
 response_line = process.stdout.readline()
 return json.loads(response_line.strip())

 async def stop_wrapper(self, process: subprocess.Popen):
 """Stop wrapper process gracefully"""
 process.terminate()
 try:
 process.wait(timeout=5)
 except subprocess.TimeoutExpired:
 process.kill()

 async def verify_postgres_state(self, server_id: int, gateway_id: int):
 """Verify database state after tests"""
 if not self.postgres_conn:
 self.postgres_conn = psycopg2.connect(
 host="localhost",
 database="mcpgateway_e2e",
 user="test",
 password="test"
 )
 
 cursor = self.postgres_conn.cursor()
 
 # Check server exists
 cursor.execute("SELECT COUNT(*) FROM servers WHERE id = %s", (server_id,))
 assert cursor.fetchone()[0] == 1
 
 # Check gateway exists
 cursor.execute("SELECT COUNT(*) FROM gateways WHERE id = %s", (gateway_id,))
 assert cursor.fetchone()[0] == 1

 async def verify_redis_cache(self):
 """Verify Redis cache state"""
 # Check cache keys exist
 cache_keys = self.redis_client.keys("*")
 assert len(cache_keys) > 0
 
 # Check specific cached data
 tools_cache = self.redis_client.get("tools:list")
 assert tools_cache is not None

 async def test_protocol_translation(self, source: str, target: str) -> 'TranslationResult':
 """Test protocol translation between source and target"""
 # Implementation for testing protocol translations
 start_time = time.time()
 
 # Perform translation test based on protocols
 success = True # Placeholder
 response_time = time.time() - start_time
 data_integrity = True # Placeholder
 
 return TranslationResult(
 success=success,
 response_time=response_time,
 data_integrity_check_passed=data_integrity
 )

 class TranslationResult:
 def __init__(self, success: bool, response_time: float, data_integrity_check_passed: bool):
 self.success = success
 self.response_time = response_time
 self.data_integrity_check_passed = data_integrity_check_passed
 ```

#### **Phase 7: Enhanced Makefile Targets**

* **7.1** **E2E testing make targets**
 ```make
 # E2E testing targets
 e2e-test-minimal:
 	@echo "🧪 Running minimal E2E test suite..."
 	@docker-compose -f docker-compose.e2e.yml up -d redis postgres
 	@$(MAKE) _wait_for_services
 	@pytest tests/e2e/test_basic_integration.py -v
 	@docker-compose -f docker-compose.e2e.yml down -v
 
 e2e-test-basic:
 	@echo "🧪 Running basic E2E test suite..."
 	@docker-compose -f docker-compose.e2e.yml up -d
 	@$(MAKE) _wait_for_services
 	@pytest tests/e2e/test_protocol_matrix.py tests/e2e/test_auth_flow.py -v
 	@docker-compose -f docker-compose.e2e.yml down -v
 
 e2e-test-standard:
 	@echo "🧪 Running standard E2E test suite..."
 	@docker-compose -f docker-compose.e2e.yml up -d
 	@$(MAKE) _wait_for_services
 	@pytest tests/e2e/ -v -k "not enterprise"
 	@docker-compose -f docker-compose.e2e.yml down -v
 
 e2e-test-enterprise:
 	@echo "🧪 Running enterprise E2E test suite..."
 	@docker-compose -f docker-compose.e2e.yml up -d
 	@$(MAKE) _wait_for_services
 	@pytest tests/e2e/ -v
 	@docker-compose -f docker-compose.e2e.yml down -v
 
 e2e-test-all:
 	@echo "🧪 Running ALL E2E test suites..."
 	@$(MAKE) e2e-test-minimal
 	@$(MAKE) e2e-test-basic
 	@$(MAKE) e2e-test-standard
 	@$(MAKE) e2e-test-enterprise
 	@echo "✅ All E2E tests completed"
 
 test-protocol-matrix:
 	@echo "🔄 Testing protocol translation matrix..."
 	@docker-compose -f docker-compose.e2e.yml up -d fast-time-stdio fast-time-sse fast-time-http translate-stdio-to-sse
 	@pytest tests/e2e/test_protocol_matrix.py -v
 	@docker-compose -f docker-compose.e2e.yml down -v
 
 test-full-stack:
 	@echo "🏗️ Testing complete stack integration..."
 	@docker-compose -f docker-compose.e2e.yml up -d
 	@$(MAKE) _wait_for_services
 	@pytest tests/e2e/test_full_stack.py -v
 	@docker-compose -f docker-compose.e2e.yml down -v
 
 _wait_for_services:
 	@echo "⏳ Waiting for services to be healthy..."
 	@timeout 300s bash -c 'until docker-compose -f docker-compose.e2e.yml ps | grep -q "healthy"; do sleep 5; echo "Waiting..."; done'
 	@echo "✅ All services are healthy"
 ```

---

### 📦 Updated Deliverables

1. **Multi-protocol fast-time-server**: Complete implementation supporting stdio, SSE, and streamable HTTP
2. **Protocol translation matrix**: Comprehensive testing of all translation combinations
3. **Authentication flow validation**: OAuth2 Bearer token security testing through wrapper
4. **Full stack Docker composition**: Complete E2E environment with all components
5. **Comprehensive test suites**: 4-tier testing from minimal to enterprise scale
6. **GitHub Actions integration**: Matrix CI testing across all component combinations
7. **Test utilities and fixtures**: Reusable E2E testing infrastructure
8. **Enhanced documentation**: Complete E2E testing guide with troubleshooting

---

### 🎯 Expected E2E Outcomes

**Integration Validation**:
- **Complete flow coverage**: All client → wrapper → gateway → backend → storage paths tested
- **Protocol translation accuracy**: 100% success rate across all 9 protocol combinations
- **Authentication security**: OAuth2 Bearer token validation with proper error handling
- **Data consistency**: L1/L2 cache and database persistence verified across all flows

**Performance Baselines**:
- **E2E latency**: <500ms for complete client-to-backend-to-response cycle
- **Protocol translation overhead**: <50ms additional latency per translation step
- **Authentication overhead**: <100ms for token validation and session establishment
- **Cache efficiency**: >95% hit rate for repeated tool calls within session

**Production Readiness Validation**:
- **Component health monitoring**: All services report healthy status
- **Error handling**: Graceful degradation when components fail
- **Federation functionality**: Multi-gateway federation works reliably
- **Security compliance**: Authentication and authorization properly enforced

---

### 🧩 Additional Notes

* **Real-world usage patterns**: Tests simulate actual MCP client behavior (Claude Desktop, Inspector)
* **Protocol fidelity**: Translation preserves all MCP protocol semantics and error conditions
* **Security-first approach**: Authentication tested at every layer with proper token validation
* **Production scenarios**: Tests include component failures, network issues, and high load
* **CI scalability**: Matrix testing enables rapid validation of new features across all combinations
* **Debugging support**: Comprehensive logging and artifact collection for troubleshooting
* **Documentation completeness**: Step-by-step guides for running, debugging, and extending E2E tests

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[CHORE]: End-to-End MCP Gateway Stack Testing Harness (mcpgateway, translate, wrapper, mcp-servers) #312

🧭 CHORE Summary — End-to-End MCP Gateway Stack Testing Harness

🏗️ Architecture Overview

Complete Stack Architecture

End-to-End Test Flow

🌊 Test Matrix & Component Combinations

🧱 Areas Affected

⚙️ Context / Rationale

📐 Enhanced Test Environment Architecture

📋 Enhanced Acceptance Criteria

🛠️ Comprehensive Task List

Phase 1: Fast-Time-Server Multi-Protocol Deployment

Phase 2: Protocol Translation Matrix Testing

Phase 3: Wrapper Authentication Flow Testing

Phase 4: Full Gateway Stack Integration

Phase 5: GitHub Actions CI Integration

Phase 6: Test Utilities and Fixtures

Phase 7: Enhanced Makefile Targets

📦 Updated Deliverables

🎯 Expected E2E Outcomes

🧩 Additional Notes

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Test Suite	fast-time-server	Translation	Gateway	Wrapper	Data Stores	Duration
Minimal	stdio only	None	Memory only	Basic	SQLite	5 min
Basic	stdio + SSE	stdio→SSE	Redis L2	OAuth2	Redis + SQLite	10 min
Standard	All 3 protocols	Full matrix	Redis + L1	Full auth	Redis + PostgreSQL	20 min
Enterprise	All + federation	All + mocks	Cluster mode	Multi-tenant	Redis cluster + PostgreSQL HA	45 min

Critical Question	Today	After This Epic
Full stack integration works end-to-end?	❓ Unknown	✅ All component combinations tested
Protocol translation handles edge cases?	❓ Unknown	📊 Matrix testing across all protocol pairs
Authentication flow secure in wrapper chain?	❓ Unknown	🔐 OAuth2 Bearer token validation
Data persistence consistent across flows?	❓ Unknown	📋 Database state validation
Federation works with real deployments?	❓ Unknown	🌐 Multi-gateway federation testing

#	Criteria	Validation Method
1	Complete stack integration: All components work together end-to-end	E2E test suite passes with 100% component coverage
2	Protocol matrix testing: All 9 protocol combinations validated	Matrix test reports show successful translation paths
3	Authentication security: OAuth2 Bearer flow secure in production	Security test suite validates token handling
4	Data consistency: All persistence layers maintain state correctly	Database validation tests pass
5	Federation functionality: Multi-gateway federation works reliably	Federation test suite with mock gateways
6	CI integration: All tests run automatically in GitHub Actions	CI pipeline completes successfully

[CHORE]: End-to-End MCP Gateway Stack Testing Harness (mcpgateway, translate, wrapper, mcp-servers) #312

Description

🧭 CHORE Summary — End-to-End MCP Gateway Stack Testing Harness

🏗️ Architecture Overview

Complete Stack Architecture

End-to-End Test Flow

🌊 Test Matrix & Component Combinations

🧱 Areas Affected

⚙️ Context / Rationale

📐 Enhanced Test Environment Architecture

📋 Enhanced Acceptance Criteria

🛠️ Comprehensive Task List

Phase 1: Fast-Time-Server Multi-Protocol Deployment

Phase 2: Protocol Translation Matrix Testing

Phase 3: Wrapper Authentication Flow Testing

Phase 4: Full Gateway Stack Integration

Phase 5: GitHub Actions CI Integration

Phase 6: Test Utilities and Fixtures

Phase 7: Enhanced Makefile Targets

📦 Updated Deliverables

🎯 Expected E2E Outcomes

🧩 Additional Notes

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions