test(conformance): add 22-case gateway conformance test suite - #209
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Adds tests/conformance/test_gateway_conformance.py with all 22 cases
from the GTC Berlin demo spec: MCP protocol (8), TRACE Claim (5), policy
enforcement (5), and session management (4). Also adds
POST /sessions/{id}/reset to MCPServer with 501/404/200 behaviour to
satisfy the session reset conformance group.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
22-case conformance test suite validating cMCP gateway protocol compliance. Tests run against an in-process Starlette
TestClientfixture with minimal mock dependencies.MCP Protocol (8 tests): health, initialize, tools/list GET, tools/call allow/deny/unknown, parse error, method-not-found, tools/list via MCP method
TRACE Claim (5 tests): trace-claim 404, trace-claim 501 (no session manager), audit-export 501, audit-export missing ?session_id → 400, session-reset 501
Policy enforcement (5 tests): allowed result with _cmcp metadata, denied → 403 + POLICY_DENY code, call_id is UUID, audit_entry_hash present, deny message non-empty
Session management (4 tests): reset returns old/new IDs, wrong ID → 404, reset clears attestation_stale, health exempt from bearer auth
Closes #75
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