Add test case

Author: felixbarny

server/src/test/java/org/elasticsearch/common/xcontent/json/JsonXContentTests.java

@@ -9,7 +9,10 @@
 
 package org.elasticsearch.common.xcontent.json;
 
+import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.xcontent.BaseXContentTestCase;
+import org.elasticsearch.xcontent.Text;
+import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentGenerator;
 import org.elasticsearch.xcontent.XContentParseException;
 import org.elasticsearch.xcontent.XContentParser;
@@ -18,6 +21,9 @@
 import org.elasticsearch.xcontent.json.JsonXContent;
 
 import java.io.ByteArrayOutputStream;
+import java.util.Set;
+
+import static org.hamcrest.Matchers.equalTo;
 
 public class JsonXContentTests extends BaseXContentTestCase {
 
@@ -41,4 +47,20 @@ public void testMalformedJsonFieldThrowsXContentException() throws Exception {
             assertThrows(XContentParseException.class, () -> parser.text());
         }
     }
+
+    public void testOptimizedTextHasBytes() throws Exception {
+        XContentBuilder builder = builder().startObject().field("text", new Text("foo")).endObject();
+        XContentParserConfiguration parserConfig = parserConfig();
+        if (randomBoolean()) {
+            parserConfig = parserConfig.withFiltering(null, Set.of("*"), null, true);
+        }
+        try (XContentParser parser = createParser(parserConfig, xcontentType().xContent(), BytesReference.bytes(builder))) {
+            assertSame(XContentParser.Token.START_OBJECT, parser.nextToken());
+            assertSame(XContentParser.Token.FIELD_NAME, parser.nextToken());
+            assertTrue(parser.nextToken().isValue());
+            Text text = (Text) parser.optimizedText();
+            assertTrue(text.hasBytes());
+            assertThat(text.string(), equalTo("foo"));
+        }
+    }
 }