[eclipse-vertx#887] Add testcase for select with fetch first

Author: DavideD

vertx-db2-client/src/test/java/io/vertx/db2client/QueryVariationsTest.java

@@ -22,6 +22,23 @@
 @RunWith(VertxUnitRunner.class)
 public class QueryVariationsTest extends DB2TestBase {
 
+  @Test
+  public void testFetchFirst(TestContext ctx) {
+    connect(ctx.asyncAssertSuccess(conn -> {
+      conn.query("select message from immutable order by id fetch first 1 rows only").execute(
+        ctx.asyncAssertSuccess(rowSet -> {
+          ctx.assertEquals(1, rowSet.size());
+          ctx.assertEquals(Arrays.asList("message"), rowSet.columnsNames());
+          RowIterator<Row> rows = rowSet.iterator();
+          ctx.assertTrue(rows.hasNext());
+          Row row = rows.next();
+          ctx.assertEquals("fortune: No such file or directory", row.getString(0));
+          ctx.assertFalse(rows.hasNext());
+          conn.close();
+        }));
+    }));
+  }
+
   @Test
   public void testRenamedColumns(TestContext ctx) {
     connect(ctx.asyncAssertSuccess(conn -> {