add testcase for issue #1584

src/test/java/com/alibaba/json/bvt/issue_1500/Issue1584.java

+package com.alibaba.json.bvt.issue_1500;
+
+import clojure.lang.Obj;
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
+import com.alibaba.fastjson.parser.DefaultJSONParser;
+import com.alibaba.fastjson.parser.ParserConfig;
+import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
+import junit.framework.TestCase;
+
+import java.lang.reflect.Type;
+import java.util.Collections;
+import java.util.Map;
+
+public class Issue1584 extends TestCase {
+    public void test_for_issue() throws Exception {
+        ParserConfig config = new ParserConfig();
+
+        String json = "{\"k\":1,\"v\":\"A\"}";
+
+        {
+            Map.Entry entry = JSON.parseObject(json, Map.Entry.class, config);
+            assertEquals("v", entry.getKey());
+            assertEquals("A", entry.getValue());
+        }
+
+        config.putDeserializer(Map.Entry.class, new ObjectDeserializer() {
+            public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
+                JSONObject object = parser.parseObject();
+                Object k = object.get("k");
+                Object v = object.get("v");
+
+                return (T) Collections.singletonMap(k, v).entrySet().iterator().next();
+            }
+
+            public int getFastMatchToken() {
+                return 0;
+            }
+        });
+
+        Map.Entry entry = JSON.parseObject(json, Map.Entry.class, config);
+        assertEquals(1, entry.getKey());
+        assertEquals("A", entry.getValue());
+    }
+}