static Tensor iiTensor() {
        return Tensor.from("tensor<bfloat16>(x[2],y[3]):[[1,2,3],[4,5,6]]");
    }
Functional testing of {@link JsonRenderer}.

@author Steinar Knutsen
@author bratseth
container-search/src/test/java/com/yahoo/search/rendering/JsonRendererTestCase.java