internal/testpb/test.proto

syntax = "proto3";

package testpb;

message FooRequest {
  bool fail = 1;
  int64 sleep_nanos = 2;
}

message FooResponse {
}

service Foo {
  rpc Single(FooRequest) returns (FooResponse);
  rpc Multiple(stream FooRequest) returns (stream FooResponse);
}