@Test
    public void testParsingOfSparseTensorWithCells() {
        Tensor tensor = assertSparseTensorField("{{x:a,y:b}:2.0,{x:c,y:b}:3.0}",
                                createPutWithSparseTensor("""
                                                          {
                                                            "type": "tensor(x{},y{})",
                                                            "cells": [
                                                              { "address": { "x": "a", "y": "b" }, "value": 2.0 },
                                                              { "address": { "x": "c", "y": "b" }, "value": 3.0 }
                                                            ]
                                                          }
                                                          """));
        assertTrue(tensor instanceof MappedTensor); // any functional instance is fine
    }
Basic test of JSON streams to Vespa document instances.

@author Steinar Knutsen
@author bratseth
document/src/test/java/com/yahoo/document/json/JsonReaderTestCase.java