@Test
    public void testWritingOfEmptyTensor() throws IOException {
        assertTensorRoundTripEquality("{}","{ \"type\":\"tensor(x{},y{})\", \"cells\": [] }");
    }
Functional tests for com.yahoo.document.json.JsonWriter.

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