added test

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

Author: asifabashar

integ-test/src/test/java/org/opensearch/sql/ppl/NewAddedCommandsIT.java

@@ -202,6 +202,19 @@ public void testAddColTotalCommand() throws IOException {
     }
   }
 
+  @Test
+  public void testFieldFormatCommand() throws IOException {
+    JSONObject result;
+    try {
+      executeQuery(
+          String.format(
+              "search source=%s  | fieldformat double_balance = balance * 2 ", TEST_INDEX_BANK));
+    } catch (ResponseException e) {
+      result = new JSONObject(TestUtils.getResponseBody(e.getResponse()));
+      verifyQuery(result);
+    }
+  }
+
   @Test
   public void testTransposeCommand() throws IOException {
     JSONObject result;