n8n-mcp/tests/integration/mcp-protocol

MCP Protocol Integration Tests

This directory contains comprehensive integration tests for the Model Context Protocol (MCP) implementation in n8n-mcp.

Test Structure

Core Tests

• basic-connection.test.ts - Tests basic MCP server functionality and tool execution
• protocol-compliance.test.ts - Tests JSON-RPC 2.0 compliance and protocol specifications
• tool-invocation.test.ts - Tests all MCP tool categories and their invocation
• session-management.test.ts - Tests session lifecycle, multiple sessions, and recovery
• error-handling.test.ts - Tests error handling, edge cases, and invalid inputs
• performance.test.ts - Performance benchmarks and stress tests

Helper Files

• test-helpers.ts - TestableN8NMCPServer wrapper for testing with custom transports

Running Tests

# Run all MCP protocol tests
npm test -- tests/integration/mcp-protocol/

# Run specific test file
npm test -- tests/integration/mcp-protocol/basic-connection.test.ts

# Run with coverage
npm test -- tests/integration/mcp-protocol/ --coverage

Test Coverage

These tests ensure:

• ✅ JSON-RPC 2.0 protocol compliance
• ✅ Proper request/response handling
• ✅ All tool categories are tested
• ✅ Error handling and edge cases
• ✅ Session management and lifecycle
• ✅ Performance and scalability

Known Issues

1. The InMemoryTransport from MCP SDK has some limitations with connection lifecycle
2. Tests use the actual database, so they require data/nodes.db to exist
3. Some tests are currently skipped due to transport issues (being worked on)

Future Improvements

1. Mock the database for true unit testing
2. Add WebSocket transport tests
3. Add authentication/authorization tests
4. Add rate limiting tests
5. Add more performance benchmarks