drpc: add unit tests for protoc-gen-go-drpc HTTP gateway route generator

[shubhamdhama]

Background

cockroachdb/drpc#56 added the protoc-gen-go-drpc generator feature that reads google.api.http annotations from proto method options and emits DRPCGatewayRoutes functions in the generated *_drpc.pb.go files. Each function returns a []drpc.HTTPRoute containing the HTTP method, path, and a reference to the corresponding RPC client method.

The PR shipped without unit tests for the generator itself.

Task

Add unit tests for the protoc-gen-go-drpc generator covering the HTTP gateway route generation logic, including:

• Correct emission of DRPCGatewayRoutes for methods with google.api.http annotations
• Skipping of streaming RPCs
• Skipping of methods without HTTP annotations
• Edge cases (multiple HTTP bindings, nested path params, etc.)

Notes

This should be relatively low-effort — a good candidate for Claude Code to scaffold the test suite. The generator logic lives in the cockroachdb/drpc repo but the tracking issue is here since that's where we manage DRPC-related work.

References

• PR: protoc-gen-go-drpc: generate HTTP gateway routes from proto annotations drpc#56

Jira issue: CRDB-63937

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