package com.alibaba.json.bvt.serializer.enum_; import org.junit.Assert; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.serializer.SerializerFeature; import junit.framework.TestCase; public class EnumFieldsTest extends TestCase { public void test_enum() throws Exception { Model model = new Model(); model.t1 = Type.A; model.t2 = null; String text = JSON.toJSONString(model, SerializerFeature.WriteMapNullValue); Assert.assertEquals("{\"t1\":\"A\",\"t2\":null}", text); } public static class Model { public Type t1; public Type t2; } private static enum Type { A, B, C } }