diff --git a/src/test/java/com/kimgo/wepush/model/WeChatMsgTest.java b/src/test/java/com/kimgo/wepush/model/WeChatMsgTest.java
new file mode 100644
index 0000000..07cce6d
--- /dev/null
+++ b/src/test/java/com/kimgo/wepush/model/WeChatMsgTest.java
@@ -0,0 +1,55 @@
+package com.kimgo.wepush.model;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class WeChatMsgTest {
+
+    @Test
+    void isInvalid_AllFieldsValid() {
+        WeChatMsg weChatMsg = new WeChatMsg();
+        weChatMsg.setPackageName("com.example.package");
+        weChatMsg.setAppName("Example App");
+        weChatMsg.setTitle("Example Title");
+        weChatMsg.setSender("Example Sender");
+        weChatMsg.setMessage("Example Message");
+
+        assertFalse(weChatMsg.isInvalid(), "WeChatMsg should be valid when all fields are valid.");
+    }
+
+    @Test
+    void isInvalid_OneFieldIsNull() {
+        WeChatMsg weChatMsg = new WeChatMsg();
+        weChatMsg.setPackageName(null); // 设置一个字段为 null
+        weChatMsg.setAppName("Example App");
+        weChatMsg.setTitle("Example Title");
+        weChatMsg.setSender("Example Sender");
+        weChatMsg.setMessage("Example Message");
+
+        assertTrue(weChatMsg.isInvalid(), "WeChatMsg should be invalid if any field is null.");
+    }
+
+    @Test
+    void isInvalid_OneFieldIsEmpty() {
+        WeChatMsg weChatMsg = new WeChatMsg();
+        weChatMsg.setPackageName(""); // 设置一个字段为空字符串
+        weChatMsg.setAppName("Example App");
+        weChatMsg.setTitle("Example Title");
+        weChatMsg.setSender("Example Sender");
+        weChatMsg.setMessage("Example Message");
+
+        assertTrue(weChatMsg.isInvalid(), "WeChatMsg should be invalid if any field is an empty string.");
+    }
+
+    @Test
+    void isInvalid_OneFieldIsStringNull() {
+        WeChatMsg weChatMsg = new WeChatMsg();
+        weChatMsg.setPackageName("null"); // 设置一个字段为字面字符串 "null"
+        weChatMsg.setAppName("Example App");
+        weChatMsg.setTitle("Example Title");
+        weChatMsg.setSender("Example Sender");
+        weChatMsg.setMessage("Example Message");
+
+        assertTrue(weChatMsg.isInvalid(), "WeChatMsg should be invalid if any field is the literal string \"null\".");
+    }
+}