### Question:
GrpcServerResponse extends RpcServerResponse implements GrpcResponse { @Override public Metadata headers() { return headers; } GrpcServerResponse(GrpcServerRequest request, Metadata headers, Status status,
      Metadata trailers); @Override Status unwrap(); @Override GrpcServerRequest request(); @Override @Nullable Throwable error(); @Override @Nullable String errorCode(); @Override Metadata headers(); @Override Status status(); @Override Metadata trailers();  }### Answer:
@Test public void headers() { assertThat(response.headers()).isSameAs(headers); }