### Question:
DescribeOp extends AbstractGeoGigOp<Optional<Map<String, String>>> { public DescribeOp setDataStore(DataStore dataStore) { this.dataStore = dataStore; return this; }  DescribeOp setTable(String table); DescribeOp setDataStore(DataStore dataStore);  }### Answer:
@Test public void testNullTable() throws Exception { DescribeOp describe = new DescribeOp(); describe.setDataStore(TestHelper.createEmptyTestFactory().createDataStore(null)); exception.expect(GeoToolsOpException.class); describe.call(); }