Add comprehensive GitHub MCP server integration tests

[Copilot]

Implements integration tests for the GitHub MCP server to validate all tool operations through the gateway.

Changes

New test file: test/integration/github_test.go (833 lines)

Test Suites

TestGitHubMCPMockBackend

• HTTP mock server simulating GitHub MCP responses
• Tests initialization handshake, health checks, and tools discovery
• No credentials required

TestGitHubMCPRealBackend

• Docker stdio transport with real GitHub MCP container
• Dynamically discovers and validates all ~50+ available tools
• Tests representative operations: branches, commits, files, search, issues, PRs
• Requires GITHUB_PERSONAL_ACCESS_TOKEN, skips gracefully if absent

Implementation Details

• MCP 2024-11-05 protocol compliance: initialize → notifications/initialized handshake
• SSE (Server-Sent Events) response parsing via parseSSEResponse helper
• Tool schema validation: name, description, inputSchema fields
• Testify assertions throughout for consistency

Example Usage

// Real backend test discovers tools dynamically
toolsReq := map[string]interface{}{
    "jsonrpc": "2.0",
    "method":  "tools/list",
}
// Returns all GitHub MCP tools: list_branches, get_file_contents, search_repositories, etc.

// Each tool is tested with minimal arguments
callReq := map[string]interface{}{
    "method": "tools/call",
    "params": map[string]interface{}{
        "name": "list_branches",
        "arguments": map[string]interface{}{
            "owner": "githubnext",
            "repo": "gh-aw-mcpg",
        },
    },
}

Follows patterns from tavily_test.go (HTTP backends) and playwright_test.go (Docker stdio).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gist.github.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Integration test with github</issue_title>
<issue_description>Run an integration test that explores the github MCP</issue_description>

<agent_instructions>Make sure that every mcp tool call is tested. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Integration test with github #113

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