fix test in JsonPathSelectorTest #289

webmagic-core/src/test/java/us/codecraft/webmagic/selector/JsonPathSelectorTest.java

 package us.codecraft.webmagic.selector;
 
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
 import org.junit.Test;
 
 import java.util.List;
@@ -44,5 +46,10 @@ public class JsonPathSelectorTest {
         select = jsonPathSelector.select(text);
         assertThat(select).isEqualTo("Sayings of the Century");
         assertThat(list).contains("Sayings of the Century");
+        jsonPathSelector = new JsonPathSelector("$.store.book[?(@.category == 'reference')]");
+        select = jsonPathSelector.select(text);
+        JSONObject object1= JSON.parseObject(select);
+        JSONObject object2=JSON.parseObject("{\"author\":\"Nigel Rees\",\"title\":\"Sayings of the Century\",\"category\":\"reference\",\"price\":8.95}");
+        assertThat(object1).isEqualTo(object2);
     }
 }