@Test
    public void tensor_modify_update_with_unknown_content_throws() {
        illegalTensorModifyUpdate("Error in 'sparse_tensor': Unknown JSON string 'unknown' in modify update for field 'sparse_tensor'",
                                  "sparse_tensor",
                                  """
                                  {
                                    "unknown": "here"
                                  }""");
    }
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