### Question:
JsonSubRow implements SubRow { public Map<String, Object> getSubRow() { return new HashMap<>(subRow); } JsonSubRow();  JsonSubRow(String splitColumn, Map<String, Object> splitRow); @Override void combineSplitRow(SubRow subRow); Map<String, Object> getSubRow();  }### Answer:
@Test public void testEmpty() { JsonSubRow subRow = new JsonSubRow(); Assert.assertTrue(subRow.getSubRow().isEmpty()); }