@Test
    public void tensor_add_update_on_dense_tensor_throws() {
        illegalTensorAddUpdate("Error in 'dense_tensor': An add update can only be applied to tensors with at least one sparse dimension. Field 'dense_tensor' has unsupported tensor type 'tensor(x[2],y[3])'",
                               "dense_tensor",
                               """
                               {
                                 "cells": [ ]
                               }""");
    }
Tests parsing of various tensor values set at the root, i.e. no 'cells', 'blocks' or 'values'
document/src/test/java/com/yahoo/document/json/JsonReaderTestCase.java