@Test
    public void testParsingOfEmptyTensor() {
        assertSparseTensorField("tensor(x{},y{}):{}", createPutWithSparseTensor("{}"));
    }
Basic test of JSON streams to Vespa document instances.

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