  void verifyGrpcServiceMethod() {
    EXPECT_TRUE(xds_stream_->waitForHeadersComplete());
    Envoy::Http::LowerCaseString path_string(":path");
    std::string expected_method(
        sotwOrDelta() == Grpc::SotwOrDelta::Sotw || sotwOrDelta() == Grpc::SotwOrDelta::UnifiedSotw
            ? "/envoy.service.cluster.v3.ClusterDiscoveryService/StreamClusters"
            : "/envoy.service.cluster.v3.ClusterDiscoveryService/DeltaClusters");
    EXPECT_EQ(xds_stream_->headers().get(path_string)[0]->value(), expected_method);
  }
  void verifyGrpcServiceMethod() {
    EXPECT_TRUE(xds_stream_->waitForHeadersComplete());
    Envoy::Http::LowerCaseString path_string(":path");
    std::string expected_method(
        sotwOrDelta() == Grpc::SotwOrDelta::Sotw || sotwOrDelta() == Grpc::SotwOrDelta::UnifiedSotw
            ? "/envoy.service.cluster.v3.ClusterDiscoveryService/StreamClusters"
            : "/envoy.service.cluster.v3.ClusterDiscoveryService/DeltaClusters");
    EXPECT_EQ(xds_stream_->headers().get(path_string)[0]->value(), expected_method);
  }