add testcase for snake naming strategy

src/test/java/com/alibaba/json/bvt/parser/deser/SmartMatchTest_snake.java

@@ -0,0 +1,22 @@
+package com.alibaba.json.bvt.parser.deser;
+
+import org.junit.Assert;
+
+import com.alibaba.fastjson.JSON;
+
+import junit.framework.TestCase;
+
+
+public class SmartMatchTest_snake extends TestCase {
+
+    public void test_0() throws Exception {
+        String text = "{\"person_id\":1001}";
+
+        VO vo = JSON.parseObject(text, VO.class);
+        Assert.assertEquals(1001, vo.personId);
+    }
+
+    public static class VO {
+        public int personId;
+    }
+}

src/test/java/com/alibaba/json/bvt/parser/deser/SmartMatchTest_snake2.java

@@ -0,0 +1,22 @@
+package com.alibaba.json.bvt.parser.deser;
+
+import org.junit.Assert;
+
+import com.alibaba.fastjson.JSON;
+
+import junit.framework.TestCase;
+
+
+public class SmartMatchTest_snake2 extends TestCase {
+
+    public void test_0() throws Exception {
+        String text = "{\"_id\":1001}";
+
+        VO vo = JSON.parseObject(text, VO.class);
+        Assert.assertEquals(1001, vo.id);
+    }
+
+    public static class VO {
+        public int id;
+    }
+}