Test gRPC streaming RPCs - Server-streaming (server returns sequence), Client-streaming (client sends sequence), Bidirectional (both sides stream independently). Cover deadline + cancellation + flow control + status codes (CANCELLED, DEADLINE_EXCEEDED) + metadata. Use ghz for load, grpcurl for ad-hoc, language-native test stubs for unit/integration. Use when a service exposes server-, client-, or bidirectional-streaming RPCs and deadline, cancellation, or partial-stream status-code behavior is unverified.