@Test
public void testAppendMetaRow() throws Exception {

    Params meta = new Params().set(SOME_PARAM, "value");
    MockCollector collector = new MockCollector();
    ModelConverterUtils.appendMetaRow(meta, collector, 2);
    Row row = collector.buffer.get(0);
    Assert.assertEquals(row.getArity(), 2);
    Assert.assertEquals(row.getField(0), 0L);
    Assert.assertEquals(row.getField(1), meta.toJson());
}